Linked Questions
32 questions linked to/from Difference between projection and datum
4
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Determining if file in projected or geographic coordinates using ArcGIS Desktop?
I have download the European grid DEM raster data from Copernicus website, which I would like to use to calculate solar radiation for smaller study site.
The ArcGIS:Area solar radiation tool requires ...
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1
vote
2
answers
3k
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Difference between EPSG:4326 and EPSG:32637?
I'm exporting data from a program into a .csv for RStudio, which will then go into ArcMap.
I haven't done this before and I've been given two projection options which are:
WGS 84 [EPSG:4326]
WGS 84 / ...
- 11
4
votes
1
answer
3k
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Which BC Albers should I use and is there any difference?
I was about to calculate the area of some polygons and before I did I did some research. I found that the area of the polygon will be represented in the units of the projection used. So I did some ...
- 593
-2
votes
1
answer
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QGIS exporting shapefile with proper projection
Can someone walk through the proper way to set a projection and export the shapefile so it will properly open up in another GIS program? I'm having trouble.
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3
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1
answer
793
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What are the highest and lowest precision Coordinate Reference Systems for US East Coast?
And does it matter what system your data layer begins with if you choose the right system for your project? Do some applications use more precise projection systems than others?
- 239
4
votes
1
answer
620
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No difference between distances measured in projected and non-projected data
I'm performing measurements of distances in Km between a lot of localities by using the "Point Distance" in ArcGis 9.3. I realized that the results obtained after using projected coordinate system are ...
e-falcon
3
votes
2
answers
1k
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Projecting vs. export using data frame projection?
I have two shapefiles with different projections. When I load both into ArcMap I get the 'Geographic Coordinate Systems Warning' when the second is loaded into table of contents but they both align ...
- 63
1
vote
4
answers
624
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Effect on using different spheroids system
Recently I am investigating case of grounding vessels, one of the findings is the paper chart used for passage planning was using Bessel 1841 spheroids, whilst the GPS system was using WGS 1984 ...
1
vote
1
answer
963
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Choosing best projection/SRID
I created a shape in OpenJump and exported it to shape(ESRI) file and then imported it to SQL2008 via shape2sql ,
the problem is that it shows bigger than what I want,
In OpenJump it shows 1meter ...
- 339
0
votes
1
answer
871
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SRID, Shape2SQL and SQL Server 2008r2 query
I'm using Shape2SQL to load the Ordinance Survey's Meridian 2 map into SQL Server 2008r2 (which is working very smoothly and painlessly).
According to this page (https://alastaira.wordpress.com/2011/...
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1
vote
2
answers
539
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How can I make the UTMs of different datasets uniform?
I have wind datasets for every U.S. state and want to merge them. I found out that these datasets use different UTMs. So I want to make the UTMs uniform. How can I do that? This can not simply be done ...
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3
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0
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465
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Why do each of my buffer-polygons have different areas
I`m using Qgis 2.2 and 2.4 and loaded a wms-map using the coordinate system ERTS89 UTM 32N. I set 8 points (all in on shp-fileand in UTM 32N) on various locations on the map. After that i created a ...
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6
votes
1
answer
293
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Do locations "move" when shifting datum?
I hope that this is the right Stack Exchange for this question. I may be oversimplifying this, but I'm looking for verification in my understanding of the following:
If I have a spatial dataset in 2 ...
- 141
2
votes
0
answers
410
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Reprojecting raster file with unknown datum using ArcGIS Desktop?
I am new to GIS. I had a grib format data file and it's coordinate system shown below. I want to project it to WGS84, however, the datum of original file is unknown. I know I need to provide the datum ...
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-1
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1
answer
219
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What is a coordinate system?
Please help me understand a coordinate system and how a coordinate system is relevant to a region of interest such as South Africa. I came across this term a couple of times and overlooked it because ...
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