GLIMS: Global Land Ice Measurements from Space

Monitoring the World's Changing Glaciers

GLIMS Tables

Date: 2005-06-02

Ancillary_Data
Area_Histogram
Area_Histogram_Data
ASTER_Footprints
Band
Country
Completeness_Level_Valids
Debris_Cover_Valids
Debris_Distribution_Valids
Dominant_Mass_Source_Valids
Form_Valids
Frontal_Characteristics_Valids
Glacier_Dynamic
Glacier_Image_Info
Glacier_Line
Glacier_Reference
Glacier_Static
Image
Image_Band
Instituion
Instrument
Instrument_Valids
Lon_Char_Valids
Package_Info
People
Point_Measurement
Primary_Classification_Valids
Reference_Doc_Code
Reference_Document
Reference_Point
Regional_Centers
Segment
Submission_Metadata
Tiepoint_Region
Tiepoint_Region_Outline
Tongue_Activity_Valids
Vector
Vector_Set



Note: The GLIMS database is implemented in PostgreSQL and PostGIS.

See previous versions of the data dictionary.

Data Dictionary

Ancillary_Data

Stores basic metadata about supporting raster datasets.

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

glac_analysis_id

varchar(20)


X

glacier_ID or analysis_ID

ID

ancillary

data_type

varchar(20)


X

Data type of the ancillary data

ancdat_typ

ancillary

location

varchar(100)


X

Location of the ancillary data. This can be a URL.

ancdat_loc

ancillary

size

int



Number of bytes

ancdat_sz

ancillary

comment

text



Free text

comment

ancillary


Area_Histogram

Stores information about a set of data on the area-elevation statistics of a glacier. The data themselves are in the Area_Histogram_Data table.

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

area_histogram_id

int

P

X

Primary Key

---

---

analysis_id

int

F

X

Glacier to which this relates (unique), foreign key, from Glacier_Dynamic

---

---

bin_width

numeric(5,1)


X

width (in m) of elevation bin

binwidth_m

histograms

registration

char(1)


X

flag, indicates whether data are bin-centered (C), lower (L), or upper (U) boundary

regist

histograms


Area_Histogram_Data

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

area_histogram_id

int

F

X

foreign key, from Area_Histogram table

---

---

elevation

float


X

representative elevation of bin, m above geoid

elev_m

histograms

area

float


X

area of glacier in this elevation bin (km2)

area_km2

histograms


Aster_Footprints

Stores metadata about ASTER scenes acquired over glacierized areas.

Field Name

Data Type

Key

Not Null

Description

ASTER_ID

INT

P

X

NSIDC assigned ID

EDC_ID

INT


X

EDC assigned ID

INSERT_TIME

Varchar(30)



Time ASTER scene was inserted at EDC

SHORT_NAME

Varchar(10)



Short name of ASTER (L1A or L1B)

VERSION_ID

INT




SIZE_MB

Varchar(30)



Total size of ASTER scene in megabytes

DAY_OR_NIGHT

Varchar(10)



Whether the ASTER was captured during the Day or Night

PRODUCTION_DATE

Varchar(30)



Date ASTER scene was produced at EDC

PGEVersion

Varchar(10)




CAPTURE_DATE

Varchar(30)



Actual date of image acquisition at the satellite

CAPTURE_TIME

Varchar(30)



Actual time of image acquisition at the satellite

MISSING_DATA

INT



Percent of missing data

OUT_OF_BOUNDS

INT



Percent of data out of bounds

INTERPOLATED

INT



Percent of data interpolated

CLOUD_COVER

INT



Percent of total cloud cover

ASTER_PROJ

Varchar(50)



Projection of ASTER Scene

QUALITY_RATING

Varchar(20)



Comment of quality of scene

ORDER_ID

Varchar(50)




AZIMUTH_ANGLE

Varchar(30)




ASTER_GAINS

Varchar(100)



Complete band availability list

BAND3

Varchar(30)



Band Availability (yes/no)

BAND10

Varchar(30)



Band Availability (yes/no)

UR_CLOUD_COV

INT



Percent of cloud cover in upper right quad.

BAND1

Varchar(30)



Band Availability (yes/no)

UL_CLOUD_COV

INT



Percent of cloud cover in upper left quad.

BAND8

Varchar(30)



Band Availability (yes/no)

VNIR_ANGLE

Varchar(30)




BAND3N

Varchar(30)



Band Availability (yes/no)

BAND6

Varchar(30)



Band Availability (yes/no)

DAR_ID

INT




TIR_ObservationMode

Varchar(5)



Mode on or off?

VNIR2_Ob_Mode

Varchar(5)



Mode on or off?

BAND13

Varchar(30)



Band Availability (yes/no)

PROCESSING_CENTER

Varchar(10)



Center where scene was processed

GRANULE_ID

Varchar(50)



Official ASTER Granule ID

BAND4

Varchar(30)



Band Availability (yes/no)

RadiometricDBVersion

Varchar(30)




SWIR_ANGLE

Varchar(30)




BAND11

Varchar(30)



Band Availability (yes/no)

CLOUD_COVERAGE

INT



Percent cloud cover

BAND2

Varchar(30)



Band Availability (yes/no)

VNIR1_Ob_Mode

Varchar(5)



Mode on or off?

BAND9

Varchar(30)



Band Availability (yes/no)

SCENE_ORIENT_ANGLE

Varchar(30)



Angle of scene orientation

GENERATION_DATE

Varchar(30)



Date scene was generated

RECIEVING_CENTER

Varchar(10)



Centers that received the scene

GEOMETRIC_DBVERSION

Varchar(50)




BAND7

Varchar(30)



Band Availability (yes/no)

TIR_ANGLE

Varchar(50)




DEM_TYPE

Varchar(20)



Type of Digital Elevation Model

DEM_SUCCESS

Varchar(30)



Percent succes of DEM correlation

BAND14

Varchar(30)



Band Availability (yes/no)

SWIR_ObservationMode

Varchar(5)



Mode on or off?

LR_CLOUD_COVER

INT



Percent of cloud cover in lower right quad.

ELEVATION_ANGLE

Varchar(50)




BAND5

Varchar(30)



Band Availability (yes/no)

LL_CLOUD_COVER

INT



Percent of cloud cover in lower left quad.

BAND12

varchar(30)



Band Availability (yes/no)

NSIDC_LOAD_DATE

date



Date loaded into GLIMS Database



Band

Stores information about individual instrument bands. This table supports the Instrument table.

Field Name

Data Type

Key

Not Null

Description

band_id

varchar(2)

P

X

Band/Mode name (or number)

instrument_id

int

F

X

ID of instrument, from Instrument table

scan_type

varchar(10)



Scan type (whisk broom, push broom, etc)

ifov_x

numeric(11,6)



Instantaneous field of view, X (radians)

ifov_y

numeric(11,6)



Instantaneous field of view, Y (radians)

sample_interval_x

numeric(6,2)



Nominal sample interval X (meters)

sample_interval_y

numeric(6,2)



Nominal sample interval Y (meters)

passband_low

numeric(7,3)



Low edge of passband

passband_high

numeric(7,3)



High edge of passband

passband_unit

varchar(5)



Standard international unit used for the passband

num_bits

int



Number of bits in DN (radiometric resolution)

num_lines

int



Number of lines per nominal scene

num_samples

int



Number of samples per line

polarization

varchar(5)



Polarization (for radar, e.g. HH, VH, etc.)



Completeness_Level_Valids

This table and the associated valids are not yet complete. We're waiting for agreement from the community on level definitions.

Field Name

Data Type

Key

Not Null

Description

completeness_level

INT

X

X

Code for level of data completion

description

varchar(30)



Description of corresponding code


Completeness_Level_Valids Definitions

Code

Description

1


2


3


4


5


6


7


8


9



Country

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

country_code

char(2)


X

ISO-3166 2-letter code

---

---

country_name

varchar(45)


X

Name of country

---

---


Debris_Cover_Valids

Not yet finalized.

Field Name

Data Type

Key

Not Null

Description

debris_cover

INT

X

X

Numerical code used for classification

description

Varchar(30)



Description of corresponding code


Debris_Cover_Valids Definitions

Code

Description

1


2


3


4


5


6


7


8


9




Debris_Distribution_Valids

Not yet finalized.

Field Name

Data Type

Key

Not Null

Description

debris_cover

INT

X

X

Numerical code used for classification

description

Varchar(30)



Description of corresponding code


Debris_Distribution_Valids Definitions

Code

Description

1


2


3


4


5


6


7


8


9



Dominant_Mass_Source_ Valids

Field Name

Data Type

Key

Not Null

Description

debris_cover

INT

X

X

Numerical code used for classification

description

varchar(30)



Description of corresponding code


Dominant_Mass_Source_Valids Definitions

Code

Description

0

Unknown

1

Snow/Drift snow

2

Avalanches

3

Superimposed ice



Form_Valids

Field Name

Data Type

Key

Not Null

Description

debris_cover

INT

X

X

Numerical code used for classification

description

varchar(30)



Description of corresponding code


Form_Valids Definitions

Code

Description

0

Uncertain or miscellaneous

1

Compound basins

2

Compound basin

3

Simple basin

4

Cirque

5

Niche

6

Crater

7

Ice apron

8

Group

9

Remnant



Frontal_Characteristics_Valids

Field Name

Data Type

Key

Not Null

Description

frontal_characteristics

INT

X

X

Numerical code used for classification

description

varchar(30)



Description of corresponding code


Frontal_Characteristics_Valids Definitions

Code

Description

0

Normal or miscellaneous

1

Piedmont

2

Expanded

3

Lobed

4

Calving

5

Coalescing, non contributing

10

Calving and Piedmont

11

Calving and expanded

12

Calving and lobed

13

Ice shelf nourishing

14

Floating

15

Terrestrial calving

16

Confluent


Glacier_Dynamic

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefiles

analysis_id

int

P

X

ID for this analysis (snapshot). An "analysis" is a particular glacier at a particular time. All segments and outlines for a particular glacier at a particular time have the same analysis_id.

---

---

glacier_id

varchar(20)

F

X

Glacier ID number, from Glacier_Static table

ID

segments, glaciers

data_source

varchar(255)ᅠ

or Integer


X

Description of data source, e.g. ASTER image, GPS survey, etc. (TEXT) or numeric code for specific type of image

data_src

session

analysis_timestamp

timestamp


X

Time stamp for this analysis (date and time)

analy_time

session

institution_id

int

F

X

ID of institution where the analysis was done, from Institution table

RC_ID

session

analyst_given_name

varchar(50)


X

First name of the person in charge of the analysis

anlst_givn

session

analyst_surname

varchar(50)


X

Last name of the person in charge of the analysis

anlst_surn

session

three_d_desc

text



Description of how 3-D information was derived (e.g. SRTM DEM, ASTER DEM, etc.)

3d_desc

session

width

float



Representative width of glacier, in meters. Note that this is difficult to define for some glaciers. We've talked about including a line_type in the segments table for storing the place where the width was measured. This is not yet implemented.

width_m

glaciers

length

float



Representative length of glacier, meters

length_m

glaciers

area

float



Representative total area of glacier, km2

area_km2

glaciers

abzone_area

float



Area of ablation zone of glacier, km2

abarea_km2

glaciers

speed

float



Representative speed, m/a

speed_myr

glaciers

snowline_elev

float



Transient snow line elevation, meters.

snowline

glaciers

ela

float



ELA value

ela_m

glaciers

ela_desc

text



Description of how ELA was determined. This is not the transient snow line.

ela_desc

glaciers

primary_classification

smallint



Classification of glaciers, currently 10 valids from WGI

prm_class

glaciers

primary_classification2

smallint



Classification of glaciers, currently 10 valids from WGI

prm_class2

glaciers

form

smallint



Form of glaciers, currently 10 valids from WGI

form

glaciers

frontal_characteristics

smallint



Enumerated field, 6 valids from WGI

frnt_char

glaciers

frontal_characteristics2

smallint



Enumerated field, 6 valids from WGI

frnt_char2

glaciers

longitudinal_characteristics

smallint



Enumerated field, 6 valids from WGI

long_char

glaciers

dominant_mass_source

smallint



Enumerated field, 4 valids from WGI

mass_src

glaciers

tongue_activity

smallint



Enumerated field, 9 valids from WGI

tngue_act

glaciers

tongue_activity2

smallint



Enumerated field, 9 valids from WGI

tngue_act2

glaciers

source_timestamp

timestamp



Timestamp of the data source.

src_time

session

debris_cover

smallint



valids indicating the debris cover condition

dbr_cov


debris_distribution

varchar(50)



description of debris distribution

dbr_dist


record_status

varchar(20)



Status of this record, e.g. retired, hidden, current, ok, etc.

rec_stat

---

completeness_level

smallint



Enumerated field indicating the level of completeness of the analysis

comp_lev

---

package_id

varchar(20)



ID of package which provides info about this record.

pack_id

---


Glacier_Image_Info

Intersection table between glacier_dynamic and image. An image can contain more than one glacier, and a glacier can be contained by more than one image.

Field Name

Data Type

Key

Not Null

Description

analysis_id

int

F

X

foreign key from Glacier_Dynamic table

image_id

int

F

X

foreign key from Image table


Glacier_Line

Each glacier, at a particular time, can have a number of line segments associated with it. They can be of various types, such as glac_bound (glacier boundary) or intrnl_rock (internal rock), etc. This is the intersection table between glacier_dynamic and segment.

Field Name

Data Type

Key

Not Null

Description

Corresponding Shapefile

analysis_id

int

F

X

from Glacier_Dynamic table

---

segment_id

int

F

X

from Segment table

---

segment_order

int


X

Serial number for the segment on glacier outline or other feature. All polygons will be made to be counter-clockwise before ingest into the database, but still, the explicit storage of segment order might be useful.

---

line_type

varchar(20)



Type of glacier lines, may be from valids

segments


Glacier_Reference

Intersection table between glacier_static (a "glacier") and reference_document (literature articles about the glacier)

Field Name

Data Type

Key

Not Null

Description

glacier_id

varchar(20)

F

X

Glacier ID number, from Glacier_Static table

reference_doc_id

int

F

X

Reference Document ID number, from Reference_Document table


Glacier_Static






Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

glacier_id

varchar(20)

P

X

Unique Glacier ID number, generated from lon/lat of glacier.ᅠ Must be of the form: GnnnnnnEmmmmm[N|S], where [N|S] means "either N or S", nnnnnn has the range [000000,359999], and mmmmm has the range [00000,90000]

ID

All

glacier_name

varchar(40)



Glacier name, if there is one.

name

glaciers

wgms_id

varchar(14)



World Glacier Monitoring Service (WGMS) ID, if assigned

wgms_id

glaciers

local_glacier_id

varchar(20)



Glacier ID used by RCs

local_id

glaciers

parent_icemass_id

varchar(20)



Reference for parent glacier ID

parent_id

glaciers

record_status

varchar(20)



Status of this record, e.g. retired, hidden, current, ok, etc.

---

---

package_id

varchar(20)



ID of package which provides info about this record.

---

---

 glacier_static_points

POINT



Point geometry, center of glaciers

static_pnt

glaciers


Image

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

image_id

int

P

X

ID of image in GLIMS

image_id

images

instrument_id

int

F

X

ID of source instrument, from Instrument table

inst_id

images

orig_id

varchar(50)



Original ID from data provider (ECS,SPOT,etc)

orig_id

images

image_loc_url

varchar(120)



URL of source of image

imglocurl

images

acq_timestamp

timestamp


X

Date/Time of image exposure

acq_time

images

image_center_lon_unc

numeric(11,4)



Uncertainty of image georeferencing - lon (m)

imglon_unc

images

image_center_lat_unc

numeric(11,4)



Uncertainty of image georeferencing - lat (m)

imglat_unc

images

image_azim

numeric(7,4)



Orientation of image (degrees east of north)

image_azim

images

cloud_pct

numeric(3,0)



Cloud severity (0 to 100%, 100% being totally cloudy)

cloud_pct

images

sun_azim

numeric(7,4)



Sun azimuth (degrees east of north)

sun_azim

images

sun_elev

numeric(7,4)



Sun elevation (degrees from horizon)

sun_elev

images

instrument_zenith

numeric(7,4)



Zenith angle of instrument pointing (degrees, 0=nadir)

inst_zen

images

instrument_azimuth

numeric(7,4)



Azimuth of instrument pointing (degrees east of north)

inst_azim

images

projection

varchar(30)



Name of projection used (e.g. polar stereographic) during digitizing of glaciers

projection

images

image_center_loc

POINT



Center point location of images

---

---


Image_Band

Intersection table between Image and Band

Field Name

Data Type

Key

Not Null

Description

band_id

int

F

X

ID of band in this image, from Band table

image_id

int

F

X

ID of image cube, from Image table


Institution

Field Name

Data Type

Key

Not Null

Description

institution_id

int

P

X

ID of institution

long_name

varchar(100)


X

Long name of institution

short_name

Varchar (100)



Short name of Institution

address1

varchar(100)



Mailing address of institution

address2

varchar(100)



Secondary mailing address of institution

address3

varchar(100)



Third mailing address of institution

city

varchar(30)



City where institution is located

country_code

char(2)

F


Country where institution is located, ISO-3166 2-letter code

institution_points

POINT



Point geometries of physical location of institutions


Instrument

Field Name

Data Type

Key

Not Null

Description

instrument_id

int

P

X

ID of instrument

instrument_long_name

varchar(80)


X

Long name of instrument

instrument_short_name

varchar(10)



Short name for the instrument

instrument_platform_name

varchar(50)



Name of platform that instrument is on

altitude

numeric(8,3)



Average orbit altitude (km)

inclination

numeric(7,4)



Orbit inclination (degrees).

num_bands

int



Number of bands

band_list

varchar(255)


X

List of names of bands/modes

eq_crossing_time

time



Time of equator crossing, for sun-synchronous satellites, generally for descending node (daytime crossing)




Lon_Char_Valids

Field Name

Data Type

Key

Not Null

Description

lon_char

INT

X

X

Numerical code used for classification

description

archar(30)



Description of corresponding code


Lon_Char_Valids Definitions

Code

Description

0

Uncertain or Miscellaneous

1

Even, regular

2

Hanging

3

Cascading

4

Ice-fall

5

Interrupted


Package_Info

Field Name

Data Type

Key

Not Null

Description

package_id

Integer

P

X

ID of the package containing analysis from RCs.

ingest_time

timestamp



Time of ingest

ingest_sw_version

varchar(10)



Software version used for the ingest

submission_filename

varchar(30)



Name of submitted files

release_date_okay

timestamp



Date that data can be made available


People

Field Name

Data Type

Key

Not Null

Description

contact_num

SERIAL

P

X

Number assigned to each individual contact

surname

Varchar (50)




givennames

varchar (80)




affiliation

int

F



prof_title

varchar (30)




department

varchar (80)




office_loc

varchar (120)




indiv_address

varchar (50)




URL1

varchar (80)




URL2

varchar (80)




workphone1

varchar (30)




workphone2

varchar (30)




workfax

varchar (30)




homephone

varchar (30)




mobilephone

varchar (30)




work_email1

varchar (40)




work_email2

varchar(100)




home_email1

Varchar (40)




home_email2

Varchar (40)




prof_interest

Varchar (120)




add_date

date



Date contact was added to database

mod_date

date



Date of last information modification


Point_Measurement

Stores results of possibly in-situ measurements taken on the glacier (e.g. temperature, debris thickness, albedo, etc.).

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

pnt_meas_id

int

P

X

ID of point measurement

---

---

glacier_id

varchar(20)

F

X

Glacier that this measurement relates to, from Glacier_Static table

ID

point_meas

pnt_timestamp

timestamp


X

Time stamp for this measurement (e.g. 2005-12-12T14:23:21Z)

timestamp

point_meas

pnt_elev

float



vertical coordinate (geoidal) elevation of measurement (m)

elev_m

point_meas

pnt_label

text



Label for the measured quantity, e.g. "debris thickness"

label

point_meas

pnt_value

float



floating point number representing value of measurement

value_

point_meas

pnt_lon_unc

float



Uncertainty of lon

lon_unc

point_meas

pnt_lat_unc

float



Uncertainty of lat

lat_unc

point_meas

pnt_elev_unc

float



Uncertainty of elevation

elev_unc

point_meas

pnt_value_unc

float



Uncertainty of point measurement value

value_unc

point_meas

pnt_unit

varchar(10)



Unit for measurement (e.g. m, degrees C, etc.)

unit

point_meas

comment

text



Free text to describe measurement, instrument, conditions, etc)

comment

point_meas

record_status

varchar(20)



Status of this record, e.g. retired, hidden, current, ok, etc.

---

---

package_id

varchar(20)



ID of package which provides info about this record.

---

---

pnt_loc

POINT


X

Point location, Geometry

--

point_meas


Primary_Classification_Valids

Field Name

Data Type

Key

Not Null

Description

primary_classification

INT

X

X

Numerical code used for classification

description

varchar(30)



Description of corresponding code


Primary_Classification_Valids Definitions

Code

Description

0

Uncertain or miscellaneous

1

Continental ice sheet

2

Ice-field

3

Ice cap

4

Outlet glacier

5

Valley Glacier

6

Mountain Glacier

7

Glacieret and snowfield

8

Ice Shelf

9

Rock Glacier

10

Ice Stream


Regional_Centers

Field Name

Data Type

Key

Not Null

Description

rc_num

SERIAL

P

X

RC identifier

parent_rc

int

F


Parent RC identifier for stewards

email_contact

int

F


Institution e-mail addresses

geog_area

text



Geographic region of RC

mou_status

text




public_flag

char(1)




comments

text




sort_key

varchar(20)




rc_outlines

Polygon



Polygons displaying region covered by RC


RC_People

Field Name

Data Type

Key

Not Null

Description

rc_num

int

F

X

References Regional_Centers table

contact_num

int

F

X

References People table


Reference_Point

The concept of this table is to store the location and small images (chips)of a reference point that can be used to geolocate imagery. It would usually be an easily identified feature, such as a river confluence, a sharp mountain peak, or a road intersection.

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

ref_pnt_id

varchar(20)

P

X

ID of reference point

---

????

ref_pnt_name

varchar(50)



Name of reference point

---

????

ref_pnt_desc

text


X

Description of the reference point (e.g. river intersection just south of Lake Aqua)

---

????

ref_pnt_lat_unc

float



Uncertainty of latitude of ref point

---

????

ref_pnt_lon_unc

float



Uncertainty of longitude of ref point

---

????

ref_pnt_elev

float



Elevation of reference point (m)

---

????

ref_pnt_elev_unc

float



Uncertainty in elevation (m)

---

????

ref_pnt_chip_location

text



Description of location(?)

---

????

ref_pnt_chip_src

int

F


Instrument ID of source image

---

????

ref_pnt_chip_num_bands

int



number of bands in chip

---

????

ref_pnt_chip_bands

varchar (30)



list of bands in chip

---

????

ref_pnt_img_line

int



line location of ref. point in original image

---

????

ref_pnt_img_samp

int



sample location of ref. point in original image

---

????

ref_pnt_chip_line

float



line location of ref. point in chip

---

????

ref_pnt_chip_samp

float



sample location of ref. point in chip

---

????

reference_doc_id

int

F


References reference_document

---

????

ref_pnt_loc

POINT



Reference point location, Geometry

---

????



Reference_Document

Field Name

Data Type

Key

Not Null

Description

reference_doc_id

int

P

X

Primary Key, ID for the reference document

tag_code

char(2)

P/F

X

Unique identifier for a specific field in reference information

tag_value

text


X

Value associated with the tag_code


Reference_Doc_Code

Field Name

Data Type

Key

Not Null

Description

tag_code

char(2)

P

X

Unique identifier for a specific field in reference information

tag_code_description

text


X

Description of the tag_code(e.g. author name, journal name)


Segment

Stores all the segments (geospatial arcs), which can be glacier boundaries, snow lines, internal rock boundaries, etc.

Note: Glacier outline polygons, as well as internal rock polygons, are required to be closed. However, if a glacier outline was digitized as a series of segments with different attributes, then the resulting segments will be stored as separate rows in this table, and the fact that they make up a closed polygons is not explicitly stored. Closure is checked by the ingest software.

Further, the ingest software imposes a vertex and segment order such that glacier outline polygons go counter-clockwise (as looking down from above), and internal rock polygons go clockwise. The analyst may digitize in any order they like, but when assigning material and feature attributes to the "left" and "right" of a segment, this ordering must be kept in mind.

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

segment_id

int

P

X

unique segment ID number

---

---

segment_type

varchar(30)


X

Can be one of "measured" or "arbitrary". A measured segment is the result of analysis of an image, either automatic or manual. An arbitrary segment is inserted to close the polygon when no information actually exists about the location of the boundary. This might be because a cloud obscures part of the boundary, or the image doesn't cover the whole glacier.

type

segments

segment_label

varchar(32)



cloud, terminus, divide, eod (edge of data), etc.

label

segments

segment_left_material

char(3)



Materials on left side: glacier,nonglacier,ice,rock,snow,vegetation,water. Left is defined as the inside of the polygon (polygons go counter-clockwise)

left_mat

segments

segment_right_material

char(3)



Materials on right side: glacier,nonglacier,ice,rock,snow,vegetation,water. Right is defined as the outside of the polygon (polygons go counter-clockwise)

right_mat

segments

orthocorrected

BOOL



Flag to indicate whether location is terrain-corrected or not

ortho

segments

loc_unc_x

numeric(11,4)



Local uncertainty of x

loc_unc_x

segments

loc_unc_y

numeric(11,4)



Local uncertainty of y

loc_unc_y

segments

glob_unc_x

numeric(11,4)



Global uncertainty of x

glob_unc_x

segments

glob_unc_y

numeric(11,4)



Global uncertainty of y

glob_unc_y

segments

seg_left_feature

char(3)



selection from valids: glacier, lake, etc. Left is defined as the inside of the polygon (polygons go counter-clockwise)

left_feature

segments

seg_right_feature

char(3)



selection from valids: glacier, lake, etc. Right is defined as the outside of the polygon (polygons go counter-clockwise)

right_feature

segments

segment_lines

LINE



Segment lines, glacier outlines, stored as PostGIS objects.

segments

segments


Submission_Metadata

Stores metadata not contained in the data transfer files that is entered via the web submission interface.

Field Name

Data Type

Key

Not Null

Description

given_name

varchar(50)


X


surname

varchar(50)


X


file_name

varchar(50)


X


file_size

int


X


submission_time

date


X


submitter_email

varchar(100)


X



Tiepoint_Region

Stores information about a region near a glacier or set of glaciers suitable for finding tie-points for coregistering images.

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

tiepoint_region_id

int

P

X

ID of tiepoint region (primary key).

ID

segments

institution_id

int

F


ID of corresponding Regional Center

RC_ID

session

tiepoint_region_timestamp

date



Time/Date the tiepoint polygon was created

timestamp

session

comment

text



Text field for additional comments

---

---


Tiepoint_Region_Outline

This table should be combined with Tiepoint_Region (i.e. it should be a polygon object in that table).

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

tiepoint_region_id

int

P/F

X

ID of tiepoint region (primary key).

ID

segments

segment_id

int

P/F

X

segment ID number, from Segment table

---

---


Tongue_Activity_Valids

Field Name

Data Type

Key

Not Null

Description

tongue_activity

INT

X

X

Numerical code used for classification

description

varchar(30)



Description of corresponding code


Tongue_Activity_Valid Definitions

Code

Description

0

Uncertain

1

Marked retreat

2

Slight Retreat

3

Stationary

4

Slight advance

5

Marked Advance

6

Possible surge

7

Known surge

8

Oscillating


Vector

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

vel_set_id

int

F

X

foreign key from Displacement_Info

---

---

first_pnt_loc

POINT


X

Point location of first image

---

vec_points

second_pnt_loc

POINT


X

Point location of second image

---

vec_points


Vector_Set

Stores a set of velocity vectors for a particular glacier. This table stores information about the whole set of vectors, while the table Vector stores the individual glaciers.

Field Name

Data Type

Key

Not Null

Description

Abbreviated Name

Corresponding Shapefile

vel_set_id

int

P

X

ID of velocity information set

---

---

analysis_id1

int

F

X

ID for the first analysis, foreign key from Glacier_Dynamic

anal_id

vec_sets

analysis_id2

int

F

X

ID for the second analysis, foreign key from Glacier_Dynamic

anal_id2

vec_sets

num_vecs

int



Number of displacement vectors (can be NULL)

num_feilds

vec_sets

loc_unc_first_lon

float



Local uncertainty of first lon (m)

p1_loc_lon

vec_sets

loc_unc_first_lat

float



Local uncertainty of first lat (m)

p1_loc_lat

vec_sets

glob_unc_first_lon

float



Global geolocation uncertainty of first lon (m)

p1_glb_lon

vec_sets

glob_unc_first_lat

float



Global geolocation uncertainty of first lat (m)

p1_glb_lat

vec_sets

loc_unc_second_lon

float



Local uncertainty of second lon (m)

p2_loc_lon

vec_sets

loc_unc_second_lat

float



Local uncertainty of second lat (m)

p2_loc_lat

vec_sets

glob_unc_second_lon

float



Global geolocation uncertainty of second lon (m)

p2_glb_lon

vec_sets

glob_unc_second_lat

float



Global geolocation uncertainty of second lat (m)

p2_glb_lat

vec_sets

record_status

varchar(20)



Status of this record, e.g. retired, hidden, current, ok, etc.

---

---

package_id

varchar(20)



ID of package which provides info about this record.

---

---


Previous versions of the data dictionary

  • Current Version
  • 2005-06-02
  • 2003-07-03
  • 2002-09-30
  • 2002-07-31
  • 2002-05-17
  • 2001-04-30