jaredbeck / tnm

The National Map

The National Map (TNM)

The National Map is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation.

Install

Prerequisites: ruby, bundler

git clone [e-mail]:jaredbeck/learn_arcgis_flt.git
bundle
bin/test

Data

• NED - National Elevation Dataset
• NHD - National Hydrography Dataset

png.rb

Read NED .flt and NHD .shp, write PNG

bin/png.rb \
  data/ned/ned_1_n43w077/usgs_ned_1_n43w077_gridfloat.flt  \
  data/nhd/ny/WBDHU8.shp \
  out.png
open out.png

References

• The National Map (TNM) Download
• ArcGIS Float-to-Raster function

File Formats

• ArcGIS Supported Raster File Formats
• Library of Congress: ESRI GridFloat Output File
• Shapefile
  • Shapefile
  • ruby-shapefile