A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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5
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2answers
4k views

Location of Coordinate Systems folder in ArcGIS 10.1

To make it easier to find and select the 3 or 4 coordinate systems we use most often in ArcGIS 9.x and 10.0 we would copy them to the top of the Coordinate Systems folder, generally located in ...
3
votes
1answer
32 views

Assigning spatial info for NetCDF files using ArcGIS for Desktop?

I have quite a few NetCDF files that arrive from a air quality model without any spatial reference. However, I do have the spatial reference information that is required. Within Arc I use "make a ...
3
votes
2answers
48 views

Alaska Series E projection in ArcGIS for Desktop?

I am trying to digitize a scanned map that appears to be in the Alaska Series E projection. I have also seen this referred to as Modified Transverse Mercator. While this projection is listed as ...
1
vote
0answers
57 views

problem with view of open layer plugin map and swiss national coordinate system in print composer

Mi projects are in the swiss coordinate system (CH0193+ / LV95) and I use Open Layers Plugin for the base map (google streets). In the normal window, this seems to work fine: As soon as I open ...
1
vote
1answer
33 views

How to change the extent of a raster after converting its coordinates?

I changed the coordinate system from Conical coordinates to lat/long UTM-39N. It's OK, but the new layer doesn't have appropriate extent, so it can't be plot on other layers. I exported the raster ...
1
vote
1answer
30 views

Would it make sense to translate a city to latitude=0 longitude=0 before doing any calculations?

I'm working on a conversion system for Unity. We want to import some geo-referenced data (not models) losing the least floating point resolution possible. I am currently working on the idea of moving ...
2
votes
1answer
77 views

Understanding coordinates in Netherlands dataset?

I have data on specific addresses of companies in the Netherlands. The dataset also provides the coordinates but they look different from what I am used to see. I converted some of the addresses into ...
1
vote
0answers
25 views

Loading AHN files correctly into MicroDEM?

In the netherlands we have the ahn elevation data files(to be found on: http://geodata.nationaalgeoregister.nl/ahn2/atom/ahn2_05m_ruw.xml) (based on rd projection). If i imort these files into ...
2
votes
2answers
4k views

Using scale bar units in QGIS composer?

I am using the scale bar of the QGIS composer (ver 1.8) and I don't understand how the whole thing works. Where can I set the units properly? The layers have idential CRS (WGS84), the settings for ...
0
votes
0answers
49 views

Calculate Tiles X,Y, Z for current view or extent in OpenLayers

Im using OpenLayers with the openstreetmap tile server. var urlTemplate = "http://c.tile.openstreetmap.org/{z}/{x}/{y}.png" I would like to download tiles for the current view or an extent. So ...
1
vote
1answer
33 views

Correct long / lat referencing typo in vector layer

This layer is completely misallinged in terms of the standard WGS84 referencing system. I played around a lot with affine transformations and the like. But I presume it is just a typo in the ...
0
votes
1answer
45 views

Using Near (proximity) tool in ArcGIS for Desktop?

I've tried changing GCS and PCS multiple ways but can't seem to figure out how to get the Near (from Proximity tools) to output the Near_DIST in feet. All it outputs is what looks like decimal ...
3
votes
0answers
55 views

Creating custom CRS based on local project parameters in QGIS?

I'm having trouble creating custom proj4 CRS files to work with existing .shp files on local project coordinates. (Local in that the coordinates are relative only to themselves and not the 'real ...
0
votes
1answer
36 views

Changing coordinate system of layer?

I am using ArcGIS 10.1 and I would like to change the coordinate system of a layer that is already attached to a drawing so that it matches the other layers.
0
votes
0answers
34 views

QGIS Server & custom CRS

I'm using QGIS Server and an OpenLayers-based web client (in EPSG:3857). I have a QGIS project that I want to serve with QGIS Server, containing layers in several CRS, including custom ones. ...
1
vote
0answers
28 views

Coordinate System choice for Nearest Neighbor

Here's an interesting scenario I came upon yesterday and I wanted to throw it out as a question to try help me visualize what is happening. I have a single point (a person, say) who is looking for ...
3
votes
1answer
48 views

Changing Dataframe Projection of .MXD to UTM Zone matching each polygon in ArcPy cursor?

I have a polygon shapefile. I used ArcPy scripts to: add a new field to the shapefile use Calculate UTM Zones on each polygon. It spits out UTM projection information into the field I've added. ...
4
votes
2answers
3k views

Misplaced Google Maps with OpenLayers plugin in QGIS?

I was using Google Maps with OpenLayers plugin in QGIS with my vector layer with projection EPSG:4326 with google map projection EPSG:3857 and "on the fly" transformation enabled. It was matching ...
3
votes
2answers
70 views

What kind of projection is this?

Can someone tell me what the projection is in this zone map from NOAA? Addendum: I am trying to replicate it (or get close) in QGIS. I know very little about GIS, but I need to do this for a web ...
5
votes
2answers
2k views

How to let the user select a spatial reference using ArcObjects?

I need to build a tool where the user selects a coordinate system for a given CAD file. What is the easiest way to do this with ArcObjects? Obviously, I could populate a list with the hundreds of ...
0
votes
1answer
52 views

Georeferencing PNG in ArcMap based off of data frame corners?

First, in Arcmap I set the data frame exactly equal to the page layout (2'hx3'w) and exported my hillshade, DEM, etc one after the other from layout view so that they were all the exact same size and ...
0
votes
2answers
105 views

Putting x y locations into ArcMap?

How can I put x,y values in an Excel spreadsheet into Arcmap? They do not show on the map when I try. I think the problem is the projection. I tried coordinate system: ...
1
vote
1answer
32 views

Plot coordinates in ArcGIS 9.3 don't make sense

I have a layer of plot features in ArcGIS 9.3 that I want the UTM coordinates for. So I used the Feature to Point tool and then added XY coordinates to each point. I then viewed the Attribute table ...
-2
votes
1answer
68 views

Lat/Long converter to local coordinate

I know that is asked quite often but I'm still doing it again :) I have a formula which I am not quite sure of the accuracy, Northing : (Latitude - Base_Latitude) * ( 6378137 * pi/180 ) Easting : ...
2
votes
0answers
43 views

Changing projection on each page of data driven pages

I am working with data driven pages and a raster image of the world. I have a separate polygon shapefile of all of the UTM zones (with a polygon for zones 1-60, north and south, for a total of 120 ...
2
votes
0answers
56 views

Can 2 GIS layers which representing the same area be compared directly while having the same datum but different coordinate system?

My question is about how coordinate systems affect comparison of different layers - I have tried to refresh my memory about coordinate systems in GIS, but am still unsure about this situation. I am ...
1
vote
1answer
37 views

QGIS does not recognize Arc-created shapefile CRS

I create a new point shapefile in QGIS (2.12) with EPSG:2927. When I view the Layer's Properties, the CRS is correctly listed as EPSG:2927. Happy! I then create a second point shapefile in Arc ...
1
vote
1answer
40 views

Extract by Mask rasters don't line up with original features in ArcGis 9.3

I have 3 features I'm trying to use to extract by mask a DEM raster layer. After I extract by mask the layers visually don't line up. When I try to do further analyses (e.g., extract to point, slope, ...
4
votes
2answers
110 views

Merging rasters in QGIS?

I have 3 modis tiles that I want to merge together. They were all reprojected in the same CRS (from sinusoidal to WGS84 UTM zone 32 N), but I cannot succeed. I have tried with merge and virtual ...
25
votes
1answer
3k views

Coordinate system for calculating areas of polygons accurately?

I have multiple polygons, all located offshore around the UK. I am trying to calculate the areas of these polygons in square kilometres, without splitting them by UTM zone. Is it possible to do this ...
1
vote
1answer
85 views

Openlayers3 using custom EPSG:25832

I want to use EPSG:25832 as the default projection for all my layers. The projection is not working correctly because the Position (center point) should be in Germany but I end up in France. When I ...
3
votes
2answers
107 views

Ukrainian topographic map: projection and coordinates?

I need some help. I managed to get Ukrainian topographic maps for my project. I'd like to do the georeferencing in QGIS. The problem is that I don't have a clue what projection was used and how to ...
4
votes
0answers
37 views

How to interpolate within defined boundaries of a deformed mesh using R?

My goal is to create an interpolation map of some output model results that are mapped on a deformed mesh (from a numerical simulation). The model results are in an x-y plane (representing ...
0
votes
0answers
51 views

Calculating distances with lat/long in decimals and WGS 84

I need to calculate the distance between points of two different datasets, once with locations of towns, the other with locations of dams. Both are located in different countries in Africa. The more ...
2
votes
2answers
153 views

Projecting shapefile with unknown CRS to WGS84 using QGIS?

I've tried setting QGIS to on the fly, changing the layer settings, nothing. I'm at a lost cause. Although I am not a GIS professional. ...
0
votes
1answer
201 views

Definition of the WGS 84

I'm having some trouble getting the following things straight with , does this make sense? EPSG:4326 WGS84 Coordinate system: WGS84 Datum/Ellipsoid: WGS84 Projection: longlat
1
vote
0answers
44 views

Changing CRS units from meters to kilometers in QGIS

I have shape files with CRS of SWEREF99 with +proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs The units are all in meters but I prefer to make a map with coordinates in ...
0
votes
1answer
58 views

Convert SQL Server spatial table with unknown coordinate reference system to GeoJSON with ogr2ogr

I have a table in SQL Server with an STSrid of 0. I would like to convert this table to GeoJSON using ogr2ogr. The problem is, despite converting to EPSG:4326, the resulting coordinates are not valid ...
3
votes
0answers
46 views

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 ...
0
votes
2answers
170 views

MODIS-Sphere to WGS84 coordinate system in ArcGIS [duplicate]

I want to overlay two global raster datasets on land use which use different coordinate systems (MODIS-Sphere & WGS84) using ArcGIS Desktop. There seems to be no direct transformation option from ...
0
votes
0answers
27 views

Coordinate system for South and North America together?

I am working on project where i need south and north america together and i search for the best coordinate system. I have choosen wgs 1984 but distortion in north part is very big.
2
votes
1answer
515 views

Measuring distances when crossing UTM zones?

I like to calculate distance between two UTM coordinates which are in different zones. Could any one point me how I can do this. I found that we can map these coordinates in to a new projection for ...
0
votes
1answer
28 views

Converting entire map to UTM 18 if only interested in part that is in UTM 18?

I am using some polygons and rasters whose initial extents cover all of Canada or all of North America. I am interested in a small area in Ontario that is in UTM zone 18. I would like to use the UTM ...
0
votes
0answers
11 views

CRS problems with SwtMapPane

I'm quite new to geotools and I'm trying to get to grips with it. Trying to load some shapefiles (see attachment) into a MapContent which in turn is associated with a SwtMapPane I always get an ...
0
votes
1answer
19 views

Layers not overlapping in QGIS? [duplicate]

I downloaded a bunch of wpts from my gps. I converted them to .SHP format with a CRS WGS 84 in QGIS, and started a new project. I then exported some satelite imagery from the internet as a tiff and ...
2
votes
3answers
173 views

Mis-aligned shapefiles in QGIS?

I'm a beginner at QGIS and I'm having trouble aligning my shapefiles. I have two datasets: one originally in WGS84 (lat/long) and another in Corrego Alegre/UTM zone 24S. I need to convert the second ...
1
vote
2answers
66 views

Defining coordinate reference system? [duplicate]

In ArcGIS and QGIS you can add data on your map and it aligns perfectly even when the Coordinate Reference System (CRS) is not set. Both softwares inform the user that the CRS is not set and it should ...
1
vote
2answers
48 views

QGIS, indoor map with relative coordinates

i am trying to create an indoor map with relative coordinates where the bottom left hand corner of the map is (0, 0), and the CRS is UTM, so the distance between coordinates is in meters. previously ...
2
votes
1answer
45 views

QGIS: Changing CRS and losing GPX track

I have a simple project — a base map and a gpx track. The basemap is from OpenLayers. I want to change the map the CRS to Arizona Central so I can use miles as units for QChainage. When I change ...
3
votes
1answer
48 views

How to unit test distance calculation beetween to points?

I want to write unit test for this query select a.id, b.id from channel a, channel b where ST_Distance_Spheroid( a.coordinates, b.coordinates, 'SPHEROID["WGS 84",6378137,298.257223563]' ) ...