Difference between revisions of "NED data in GridFloat format"
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Once the files have been downloaded use the following proceedure to set up with Pathloss 5 | Once the files have been downloaded use the following proceedure to set up with Pathloss 5 | ||
| − | Unzip the files to a common directory. 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 noraml and you should select yes. Do not modify or delete any of the other files. | + | 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 noraml 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: | Once unzipped you should have a directory tree similar to the following: | ||
| − | floatn45w101_1.flt | + | NED_1_GRIDFLOAT |
| + | | | ||
| + | |-floatn45w101_1.flt | ||
floatn45w101_1.hdr | floatn45w101_1.hdr | ||
floatn45w101_1.prj | floatn45w101_1.prj | ||
Revision as of 12:39, 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.
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 proceedure to set up with Pathloss 5
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 noraml 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 list 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
