Example Gridview grids

Example Gridview grids

Available Grids in EGDR (.IMG) format:

The official download site for "raw" MOLA Mars topography grids is located at:

Planetary Data System MOLA MEGDR download page

This site has the MOLA Mission Experiment Gridded Data Records (MEGDRs) available at various resolutions. The Gridview user will need to use the "Load EGDR (IMG) Grid" option under the "File" tab to load a grid. The data comes as a pair of files. The “.img” file contains the actual gridded data and an associated ".lbl" file contains meta-data information that explains the contents of the ".img" file.

After the user selects "Load EGDR (IMG) Grid" a file selection window will pop-up for the user to select an ".img" file. After that, another windowl pops-up that requires the user to fill in five pieces of information needed by Gridview to accurately place the data geographically. This information can be found in the ".lbl" file.

The questions and the associated ".lbl" tags are:

Min (East) Lon: WESTERNMOST_LONGITUDE
Max (East) Lon: EASTERNMOST_LONGITUDE
Max Lat: MAXIMUM_LATITUDE
Min Lat: MINIMUM_LATITUDE
Pixel per degree: MAP_RESOLUTION

Once the user enters the values and clicks "Accept" the grid will display in the main Gridview window.

Example MOLA Mars topography Grids in IDL 'Save' (.sav) format:

(Download by right clicking with "Save link as" option or shift+Button1)

mola_1.sav - One degree grid (.26 Mb)
(One pixel per degree, 1.0 spacing) 360 x 180

mola_02.sav - Half degree grid (1 Mb)
(Two pixels per degree, .5 spacing) 720 x 360

mola_04.sav - Quarter degree grid (4.1 Mb)
(Four pixels per degree, .25 spacing) 1440 x 720

An example MOLA Mars high resolution topography grid in GMT (.GRD) format:

(Right-Click and Save Link Target As... for the following link)

30s_0_300e_330e.grd a 30 degree by 30 degree region (153 Mb)
(128x256 pixels per degree) 4481 x 8961


LOLA Lunar topography grids from the Gridview workshop in GMT (.GRD) format:

(Download by right clicking with "Save link as" option or shift+Button1)

ldem_16.grd - (66 Mb)
(16 pixels per degree)

LDEM_64_100e_260e_70s_70n_v1.0.grd - (367 Mb)
100 - 260 East Longitude, 70 South - 70 North Latitude
(64 pixels per degree)

LDEM_64_220e_20e_70s_70n_v1.0.grd - (367 Mb)
220 - 20 East Longitude, 70 South - 70 North Latitude
(64 pixels per degree)

LDEM_64_340e_140e_70s_70n_v1.0.grd - (367 Mb)
340 - 140 East Longitude, 70 South - 70 North Latitude
(64 pixels per degree)

LDEM_64_0e_360e_45n_90n_v1.0.grd - (265 Mb)
0 - 360 East Longitude, 45 - 90 North Latitude
(64 pixels per degree)

LDEM_64_0e_360e_45s_90s_v1.0.grd - (265 Mb)
0 - 360 East Longitude, 45 - 90 South Latitude
(64 pixels per degree)

Warning! The following file is very large. Computers with limited memory may not be able to load the grid into Gridview.
ldem_64.grd - (1Gb)
0 - 360 East Longitude, 90 South - 90 North Latitude
(64 pixels per degree)


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Responsible NASA official: Dr. Herbert Frey
Web Curator: Jim Roark (ADNET)
Email James.H.Roark@nasa.gov with comments or suggestions
Last modified on Jan 18, 2012