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Apr
13
awarded  Notable Question
Apr
17
awarded  Popular Question
Apr
5
awarded  Tumbleweed
Mar
29
comment How to read this data file and convert it to raster format for analysis?
I am afraid that I can hardly handle Arcgis let alone QGIS. Is there some way to convert the file before importing it?
Mar
29
comment Why do ArcGIS Area Calculations not match Official Statistics?
My source is thematicmapping.org/downloads/world_borders.php. I project it at an equal area projection.
Mar
29
asked How to read this data file and convert it to raster format for analysis?
Mar
21
asked Which Geographic Transformation to use for WGS_84 to D_Sphere?
Mar
21
comment Why do ArcGIS Area Calculations not match Official Statistics?
I use ArcGIS 10.1. To change projection I go to Data Management tools->Projections and Transformations->Raster-Define Projection. Is this the right procedure? The differences lie in the range of 10-30%, thus not in a systematic way.
Mar
20
asked Why do ArcGIS Area Calculations not match Official Statistics?
Mar
18
comment Distance from waterways
Thanks for all the comments. I ll will try both and see if they generate significan differences.
Mar
18
comment Zonal Statistics-Weighting
Thanks for the comments. I will try the equal area projection. Unfortunately I am new to ARC GIS so I already have difficulties with already, let alone moving to a different software.
Mar
18
comment Distance from waterways
THanks! It sound very feasible and I ll try it instantaneously. One more question. As to calculating the area do I need to somehow to weight the cells for each given latitude? i.e. the cells near the equator represent a larger are than the cells near the pole.
Mar
18
awarded  Student
Mar
18
asked Distance from waterways
Mar
18
comment Zonal Statistics-Weighting
I should clarify that I work with ARCGIS 10.1
Mar
18
asked Zonal Statistics-Weighting