Difference between revisions of "NED data in GridFloat format"

Revision as of 13:37, 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. 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:

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