wilsos85

DEM general questions, raster data symbology, DEM symbology to shapefile

Discussion created by wilsos85 on Nov 12, 2013
Latest reply on Jul 2, 2014 by curtvprice
I'm using ArcMap 10 and have 1 arc-second, 1/3 arc-second, and 1/9 arc-second DEMs. I understand that 1/9 arc-second is about 3 meters, 1/3 arc-second is about 10 meters, and 1 arc-second is about 30 meters (http://ned.usgs.gov/).

1. This means 3 m by 3 m cell, 10x10, and 30x30? (Just making sure).

2. To change the symbology of the DEM, I use the option "classified" and am separating the cell values into certain heights "100, 250, 500" meters. Am I okay in assuming that the cell values of the DEM represent heights in meters at each 10x10 cell (of whatever arc-second map I'm using) ?

3. After I change the symbology of the DEM, is there anyway to make these sub-divisions into shapefiles? Similar to the process of highlighting certain areas/lines/points in a shapefile and then exporting it to its own shapefile? I would like to do this process for the DEM with certain elevation sections (i.e. 100-250 meters, 250-500 meters). Is this possible?

Thank you. I'm pretty new to ArcGIS.

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