Difference between revisions of "NED data in GridFloat format"
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[[File:GIS-NED-1.png]] | [[File:GIS-NED-1.png]] | ||
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Select the '''''Primary DEM''''' tab, set the '''''Digital elevation model''''' to '''''GridFloat (NAD83)''''', and click '''''Index''''' | Select the '''''Primary DEM''''' tab, set the '''''Digital elevation model''''' to '''''GridFloat (NAD83)''''', and click '''''Index''''' | ||
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[[File:GIS-NED-2.png]] | [[File:GIS-NED-2.png]] | ||
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| + | In the Index click '''''Files - Import index - Create for folder-subfolders''''' | ||
[[File:GIS-NED-3.png]] | [[File:GIS-NED-3.png]] | ||
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| + | Select the directory, in this case it is NED_1_GRIDFLOAT. Also set the '''''Files of type''''' to '''''grid float - new''''' and click '''''OK''''' | ||
[[File:GIS-NED-4.png]] | [[File:GIS-NED-4.png]] | ||
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| + | You should now see the files in your index. They are ready to use. Click '''''Files - Close''''' or the red X in the upper right corner to exit the index. Once back in the '''''Configure geographic system''''' dialog box, click '''''OK''''', you will be prompted to save your changes. | ||
Revision as of 13:13, 11 March 2015
This is the same NED data except in Grid float format. These files are twice as big as the BIL format. They will run a bit slower for generating network backgrounds.
Contents |
Downloading
The files are named by the North West corner having the following syntax:
NXXWYYY.zip where XX = the latiude in degrees and YYY = longitude in degrees
The files are available in two resolutions:
1" GridFloat files (covers North America):
ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/1/GridFloat/
1/3" GridFloat files (covers the USA):
ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/13/GridFloat/
Using with Pathloss 5
Once the files have been downloaded use the following procedure to set up with Pathloss 5
Step 1
Unzip the files to a common directory, in this case we will make a directory called NED_1_GRIDFLOAT. Each ZIP file will contain 22 files, a FLT file and 21 supplemental files. When unzipping multiple archives to the common directory, you may be prompted to overwrite some existing files, this is normal and you should select yes. Do not modify or delete any of the other files.
Once unzipped you should have a directory tree similar to the following:
NED_1_GRIDFLOAT | |-floatn45w101_1.flt |-floatn45w101_1.hdr |-floatn45w101_1.prj |-floatn45w101_1_thumb.jpg |-n45w101_1_meta.dbf |-n45w101_1_meta.html |-n45w101_1_meta.prj |-n45w101_1_meta.sbn |-n45w101_1_meta.sbx |-n45w101_1_meta.shp |-n45w101_1_meta.shp.xml |-n45w101_1_meta.shx |-n45w101_1_meta.txt |-n45w101_1_meta.xml |-ned_1arcsec_g.dbf |-ned_1arcsec_g.prj |-ned_1arcsec_g.sbn |-ned_1arcsec_g.sbx |-ned_1arcsec_g.shp |-ned_1arcsec_g.shx |-NED_DataDictionary.url |-readme.pdf
Step 2
Start Pathloss 5 and click Configure - Set GIS configuration
Select the Primary DEM tab, set the Digital elevation model to GridFloat (NAD83), and click Index
In the Index click Files - Import index - Create for folder-subfolders
Select the directory, in this case it is NED_1_GRIDFLOAT. Also set the Files of type to grid float - new and click OK
You should now see the files in your index. They are ready to use. Click Files - Close or the red X in the upper right corner to exit the index. Once back in the Configure geographic system dialog box, click OK, you will be prompted to save your changes.
