Special Topics: Lab 13

Week 13 lab focused on how scale and resolution can affect the details of an image.  The first part of the lab looked at vector data while part be focused on raster data.  The first part of the lab compared polylines and polygons at different scales.  The second part of the lab compared LIDAR and SRTM with cell size at 90 m.  SRTM is a very high resolution images.

To compare the two, I had to change the projection of the DEM and resampled it to have the cell size of 90 m.  After that process was complete, I used the Slope tool to find the average slope.  I compared the slope to the LIDAR slope.  I also visually compared the two images.  The LIDAR image has a larger slope and the low elevations are more noticeable in the LIDAR image than SRTM.

Below are the results of the analysis I performed.  The SRTM images shows less change in the elevation than the LIDAR.  As seen in the average slopes, the SRTM has the lower slope.

LIDAR

SMRT