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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Correctly Setting Spatial Reference for Geometry Objects when Geoprocessing

I'm attempting to find the nearest distance between a set of points, and a set of polygons. I don't want to use near tables because I have to do this operation for a large number of different ...
3
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1answer
41 views

using a linear solver to get a “centre of gravity” of a set of points

As a programmer, if I have a linear solver available. How can I formulate the following problem as a set of constrains / decisions / goals for the linear solver? I have a matrix of say 10*10, so 100 ...
3
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2answers
75 views

Reading Lambert Conformal Conic NetCDF into GeoServer?

I'm working on reading in a NetCDF file into GeoServer and GeoServer has no problem reading it in as a data store, but when I go to publish the layer from the data store I get an error that states ...
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2answers
42 views

Latitude / Longitude Polygon from New Zealand Geodatabase or Shapefile?

I have access to ESRI Geodatabase and Shapefile: http://www.stats.govt.nz/browse_for_stats/Maps_and_geography/Geographic-areas/digital-boundary-files.aspx. What I need is to somehow get the polygons ...
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1answer
40 views

Define Projections for layers with multiple locations in MXD's

# Script to use Layers in MXD source file paths to locate and redefine projections import arcpy, glob, os, sys, arcgisscripting mxd = arcpy.mapping.MapDocument("N:\MXDs\_ThomaKL\MXD GPS ...
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1answer
41 views

Calculating Angle between two GPS Coordinates in QGIS

i'm looking to create an angle attribute inside a layer of points that has a starting coordinate and a finishing coordinate. The angle needs to be 0-360. Is there a field calculator command that I ...
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2answers
32 views

Trying to maintain spatial reference on newly created numpy array

I am trying to copy the values from raster into newly created array and then trying to save the array with same spatial reference as raster file inRas = arcpy.GetParameterAsText(0) double_layer = ...
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16 views

Is the GCJ-02 coordinate reference system available in QGIS?

I am trying to calculate distances between points in a Chinese province. The measure tool and distance matrix both provide the distance in terms of degrees. I read earlier that I need to change the ...
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2answers
66 views

Redefining point shapefiles in MXD that have no projection and are located in different folders using ArcPy?

# Script to use Layers in MXD source file paths to locate and redefine projections import arcpy, glob, os, sys, arcgisscripting from arcpy import env, mapping path = os.getcwd() env.workspace = ...
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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 ...
3
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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 ...
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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 ...
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0answers
46 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 ...
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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.
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1answer
44 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 ...
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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 ...
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0answers
27 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
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0answers
53 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 ...
3
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1answer
47 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. ...
3
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2answers
69 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 ...
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1answer
50 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 ...
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0answers
52 views

Calculating areas in metric units on polygons that are stored in geographic coordinate reference system using ArcPy?

If one uses arcpy to calculate areas for a field in metric units on a polygon shapefile in a geographic coordinate system it will work, and give you plausible results. According to the documentation ...
3
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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 ...
1
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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 ...
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41 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 ...
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1answer
44 views

Defining Projection Lambert Conformal Conical w custom GCS

I have a shape file from Mexico´s INEGI site that doesn´t have prj file. I am having trouble defining the projection in Arc. INEGI tells me it is projected as Lambert Conformal Conical with a ITRF92 ...
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1answer
67 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
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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
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1answer
35 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 ...
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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, ...
1
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1answer
73 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 ...
4
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2answers
106 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 ...
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0answers
50 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 ...
3
votes
2answers
104 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
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0answers
35 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 ...
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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 ...
3
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0answers
45 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 ...
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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.
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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 ...
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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
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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 ...
0
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1answer
57 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 ...
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2answers
46 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
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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]' ) ...
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0answers
21 views

Layer is too small compared to rest of map? [duplicate]

I do apologize I am very new when it comes to this, this is my first GIS class. So I have one layer like this And I am trying to add another layer, but it is extremely small and placed in the ...
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1answer
17 views

Comparing Coordinate Reference Systems in GeoTools

This seems like a pretty silly problem. I'm using a Maven build with GeoTools 14.0. All I want is to compare CRSs with flexibility so that it doesn't have to be exactly equal as long as all the ...
1
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1answer
28 views

How to calculate areas for data that covers the whole of Australia [duplicate]

I have a polygon shapefile showing mining areas across all of Australia. I want to calculate the area for each of the polygons however they have been provided in a Geographic Coordinate System ...
4
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1answer
135 views

How do you check if two feature classes have the same spatial reference?

Using arcpy, how do you check if two feature classes have the same spatial reference? Just checking if the two are equal doesn't work: >>> import arcpy >>> fc1 = ...
1
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1answer
54 views

NAD 1983 Illinois State Plane- not projecting correctly

I'm having trouble with CAD drawings not projecting correctly within ArcMap 10.2. I am working in NAD 1983 State Plane Illinois East FIPS 1201 (US Feet) and want my CAD drawing to be located in the ...