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location SFN, Treaty No. 8
age 28
visits member for 3 years, 11 months
seen 17 hours ago

I've had a career in GIS since 2006, but it's also a hobby where this site helps answer lots of those off-the-beaten-path questions I always come up with.


1d
answered NDVI derived from Landsat band 3 and band 4 using QGIS raster calculator shows the different range when opening in the ArcGIS
2d
comment NDVI derived from Landsat band 3 and band 4 using QGIS raster calculator shows the different range when opening in the ArcGIS
Where did you see the ranges in QGIS? Just visually or in the metadata?
2d
comment How to convert the SRTM DEM orthometric to ellipsoidal heights using ArcGIS or others GIS?
Would you be able to update your question to explain some of the things you tried so far? I think it would help others find where the problem is.
Oct
22
answered Get cell size for raster in QGIS
Oct
22
answered Visualize overlapping line vertices in QGIS
Oct
21
comment Visualize overlapping line vertices in QGIS
Do you want this done just visually for the effect, without doing it using some gis processing functions?
Sep
30
awarded  Explainer
Sep
18
comment How can I store height info from GPS in QGIS?
@SS_Rebelious I think in this case, the OP is trying to capture points directly in QGIS using the GPS panel, instead of importing GPS data after it's been collected with the GPS Device - at which point it probably would be fully attributed with x,y,z info.
Sep
17
comment How to build QGIS on CentOS?
Can you update your question with the error you get from trying to install GRASS? Also looks like you need to install Proj4 or set the include dir with cmake. Could you try installing qwt and qwtpolar as well?
Sep
16
awarded  qgis
Sep
15
comment WFS with authentication to PostGis (or to shape)
It might depend on how the www server implements user authentication (ie, basic vs digest vs ldap, or other means). But you could try to use the UserPwd option for WFS' in ogr2ogr as a first attempt. See gdal.org/drv_wfs.html
Sep
15
revised Where is the OpenLayers Plugin in QGIS 2.4?
update title to a question
Sep
15
answered Where is the OpenLayers Plugin in QGIS 2.4?
Sep
11
answered Polygon Shape Data for North America
Sep
11
comment Creating blended colour relief in QGIS?
@WhiteboxDev it makes it also interesting because you can change the numbers in the "value" column to determine where those colours blend into each other based on elevation.
Sep
11
comment Creating blended colour relief in QGIS?
@WhiteDev I think in the palette (on the left) you see five distinct classes but it can be controlled by the user when changing from "Continuous" to "Equal Interval" and in this case defaults to 5, but is still uses a "linear" option to blend them together. I think QGIS can be improved to show a gradient in the legend on the print composer because it still shows the distinct classes when using linear colour blending.
Sep
11
comment Creating blended colour relief in QGIS?
@WhiteboxDev the blending mode (multiply) allows the gradient DEM to overlay the hillshade without losing much saturation, the original colours won't have that washed out look. That's something cartographers often do in external graphics editing programs making map making a tedious process.
Sep
8
comment Using GDAL to read dted files
are you trying to do this via programming, with the gdal command line utilities, or some other GIS software package?
Aug
21
reviewed Approve suggested edit on How to create a line output from a buffer instead of a polygon?
Aug
20
answered How to install Apache Web Server from OSGeo4W?