{"id":1038,"date":"2018-12-08T01:24:42","date_gmt":"2018-12-08T01:24:42","guid":{"rendered":"https:\/\/www.ssec.wisc.edu\/mcidas\/?page_id=1038"},"modified":"2025-01-28T22:55:42","modified_gmt":"2025-01-28T22:55:42","slug":"mcbasemaps","status":"publish","type":"page","link":"https:\/\/www.ssec.wisc.edu\/mcidas\/mcbasemaps\/","title":{"rendered":"McIDAS Basemaps"},"content":{"rendered":"

The images below can be used as basemaps for the McIDAS IMGRGB<\/a> command or as standalone basemaps for other graphical applications. Due to the large size of these 1km global rectilinear images (21600 x 43200), we recommend that you create an ADDE dataset for the basemaps. The individual files can be downloaded, uncompressed, and then served as McIDAS AREA files. All of the compressed AREA files can found at ftp:\/\/ftp.ssec.wisc.edu\/pub\/mug\/basemaps<\/a>.<\/p>\n

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Land Elevation<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\n<\/tr>\n
Download the following files to create a Land Elevation image like that shown above:<\/td>\n<\/tr>\n
topo.gz<\/a><\/td>\n323 MB<\/td>\n2-byte AREA file created from USGS Digital Elevation Models (DEMs)<\/a><\/span>
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
TOPO.ST<\/a><\/td>\n2 KB<\/td>\nStretch table for Land Elevation image above<\/td>\n<\/tr>\n
HRTOPO.ET<\/a><\/td>\n4 KB<\/td>\nEnhancement table for Land Elevation image above<\/td>\n<\/tr>\n
The RAW values are as follows:<\/td>\n<\/tr>\n
<\/td>\n\n
0-8752<\/div>\n<\/td>\n
Height above sea-level<\/td>\n<\/tr>\n
<\/td>\n\n
55537<\/div>\n<\/td>\n
Ocean<\/td>\n<\/tr>\n
<\/td>\n\n
>55537<\/div>\n<\/td>\n
Height below sea-level = (RAW – 65536)<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/p><\/div>\n
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Land Elevation and Waterways<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n
<\/th>\n<\/tr>\n
Download the following files to create an image of Land Elevation and Waterways like that shown above:<\/td>\n<\/tr>\n
topolakes.gz<\/a><\/td>\n321 MB<\/td>\n2-byte AREA file created by combining USGS Digital Elevation Models (DEMs)<\/a> and USGS Land Cover data<\/a>.
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
TOPO.ST<\/a><\/td>\n2 KB<\/td>\nStretch table for Land Elevation and Waterways image above<\/td>\n<\/tr>\n
HRTOPO.ET<\/a><\/td>\n4 KB<\/td>\nEnhancement table for Land Elevation and Waterways image above<\/td>\n<\/tr>\n
The RAW values are as follows:<\/td>\n<\/tr>\n
<\/td>\n\n
0-8752<\/div>\n<\/td>\n
Height above sea-level (regions at or below sea-level = 0)<\/span><\/td>\n<\/tr>\n
<\/td>\n\n
55537<\/div>\n<\/td>\n
Ocean\/Lakes\/Rivers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n\t\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n

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Land Sea Mask<\/h3>\n
\n\n\n\n\n\n\n\n\n\n
<\/th>\n<\/tr>\n
Download the following files to create a Land Sea Mask image like that shown above:<\/td>\n<\/tr>\n
land_sea_mask.gz<\/a><\/td>\n4 MB<\/td>\n1-byte AREA file created from USGS Land Cover data<\/a>.
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
LSMASK.ET<\/a><\/td>\n4 KB<\/td>\nEnhancement table for Land Sea Mask image above<\/td>\n<\/tr>\n
The RAW values are as follows:<\/td>\n<\/tr>\n
<\/td>\n\n
8<\/div>\n<\/td>\n
Land values above and below sea-level<\/span><\/td>\n<\/tr>\n
<\/td>\n\n
4<\/div>\n<\/td>\n
Ocean\/Lakes\/Rivers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n\t\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n

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Land Use<\/h3>\n
\n\n\n\n\n\n\n
<\/th>\n<\/tr>\n
Download the following files to create a Land Use image like that shown above:<\/td>\n<\/tr>\n
landuse.gz<\/a><\/td>\n33 MB<\/td>\n1-byte AREA file created from USGS Land Cover data<\/a>.
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
landuse.txt<\/a><\/span><\/td>\n3 KB<\/td>\nText file containing the RAW value definitions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n\t\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n

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NASA's Blue Marble<\/h3>\n
\n\n\n\n\n\n\n\n\n
<\/th>\n<\/tr>\n
Download the following files and use the McIDAS COMBINE<\/a> command to create a NASA Blue Marble Next Generation<\/a> image like that shown above:<\/td>\n<\/tr>\n
bigbluemarblered.gz<\/a><\/td>\n236 MB<\/td>\nAREA file containing the red channels of the Blue Marble basemap
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
bigbluemarblegreen.gz<\/a><\/td>\n239 MB<\/td>\nAREA file containing the green channels of the Blue Marble basemap
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
bigbluemarbleblue.gz<\/a><\/td>\n221 MB<\/td>\nAREA file containing the blue channels of the Blue Marble basemap
\n(21600 lines x 43200 elements)<\/td>\n<\/tr>\n
When using this basemap for web or other publications, please provide the following credit line –
\nThe basemap was provided by Earth Observatory Team – NASA (http:\/\/earthobservatory.nasa.gov<\/a>).<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/p><\/div>\n