Slope Map Comparison

Nanjing is UTM zone 50

Missing data: not always entered in Geotiff, and different standards

MICRODEM--geographic coordinates MICRODEM--reinterpolated UTM coordinates

 


Slope maps computed in 4 different programs were all imported into MICRODEM.  These use the program defaults, adjusted only to have all 4 programs report slope in percent.

QGIS and Whitebox have essentially identical histograms, but significant differences in point values.  MICRODEM and SAGA are both significantly steeper slopes than the other two, but are generally comparable. SAGA has substantially more missing data than any of the others.

 

 

MICRODEM SAGA ArcGIS
 
QGIS Whitebox  

 


Default Slope Maps in Each Program

SAGA
QGIS
GRASS
Whitebox
MICRODEM
ArcGIS

Last revision 10/9/2013