20,436 reputation
1055
bio website uclouvain.be/lifewatch
location Belgium
age
visits member for 1 year, 5 months
seen 14 hours ago

16h
reviewed No Action Needed Identifying Left and Right Mouse Button Clicks in PyQgis application
16h
reviewed No Action Needed QGIS 2.8.2 Road Graph doesn't accept road network vector
16h
reviewed No Action Needed GRASS make local relief error
2d
reviewed Approve DEM/Raster Peak and Valley identification and/or elimination (non-generalization)
May
19
answered Why does Select by Location select points outside search radius?
May
14
comment Populating an attribute inside a loop
thanks, it is corrected
May
14
revised Populating an attribute inside a loop
edited body
May
14
comment How to set feature vertex Z from an intersecting feature's Z?
do input and output lines have the constant Z ?
May
14
answered Populating an attribute inside a loop
May
14
answered selection by attribute
May
14
revised How to calculate Cost Surface Analysis in ArcGIS 10.x
added 7 characters in body
May
14
revised How to calculate Cost Surface Analysis in ArcGIS 10.x
added 254 characters in body
May
14
comment How to calculate Cost Surface Analysis in ArcGIS 10.x
depending on the walker, walking speed range from 3 to 5 km/h. so you can get the time by dividing the cell size by the speed. If there is a "challenge" that hinders normal speed, you can use a cost raster with longer time for more difficult walk. I don't understand the information that your are looking for (problem using the tools or problem finding typical speed values). So you would attract better answers by editing your question.
May
13
answered How to calculate Cost Surface Analysis in ArcGIS 10.x
May
13
comment How to calculate Cost Surface Analysis in ArcGIS 10.x
do you have spatial analyst ?
May
13
comment How to calculate mean aspect in circular statistics?
As long as you know the configuration, it's OK. The mean angle is the mean angle, no matter where the origin is located and the orientation.
May
13
comment How to calculate mean aspect in circular statistics?
@Mah yes, R works with angles in radian, so you need to transform from degree to radian before sin and cos, then from radian to degree after atan2
May
13
comment How to calculate mean aspect in circular statistics?
@whuber Thank you, with atan2(x,y) you don't need to test the sign of sine and cos. I've updated my answer.
May
13
revised How to calculate mean aspect in circular statistics?
deleted 52 characters in body
May
13
answered How to calculate mean aspect in circular statistics?