The process of translating a map or spatial data from one geographic projection to another

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239 views

Reprojecting a raster DEM from meters to feet using QGIS?

Is there a tool in QGIS that does the same as reprojecting a raster DEM from meters to feet as in ArcGIS's 3D Analyst > Raster Math > Times ?
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1answer
206 views

How can I take a large netcdf and convert it to interpolated values in a different set of coordinates?

I've got a large netcdf (a small portion of the data is here) with the data in an even grid associated with an Albers Equal Area Conic projection. I've got the corresponding latitudes and longitudes ...
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0answers
173 views

How to install Proj4js.js in my localhost directory?

I'm developing a GIS website for vineyard management. I am using Openlayers with the WMTS IGN (French institute for geography) datas. It works fine. I also would like to add the possibility for the ...
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18 views

DD83 to State Plane conversion

I am having an elementary issue with a conversion I have completed successfully in the past in ArcMap10. I am trying to convert DD83 to State Plane 83 using Data Management Tools > Feature > Project. ...
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1answer
147 views

Is there any tool to reproject x,y coordinates, apart from Proj4?

I have a JEE project (Java, JBoss) and I'm looking for a library that allows x,y coordinates reprojection. I know about Proj4. Do you have any other option? Is it possible to find on the net a ...
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1answer
94 views

How to covert gridded (gnomonically projected by distance) data to lat/long data

I have a grid of data that is in a gnomonic projection, centered on a lat/long point (WGS-84). The grid has a 1km spacing. Given this I can easily obtain the x,y coordinates/distances from centre ...
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94 views

How to georeference a map - which is in projected coordinate system - using geographic lat long? [duplicate]

We have some hard copy maps which were projected in Gauss Kruger coordinate system (in the legend it has been mentioned). But, the coordinates were given in Geographic lat long (Beijing 1954). In ...
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2answers
173 views

How do I construct (or select) an appropriate local Cartesian coordinate system, for an arbitrary small area?

I'm relatively inexperienced with coordinate reference systems, so please bear with me if I'm not putting this clearly. I have existing software which works with an abstract (un-referenced) 3D ...
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1answer
182 views

Creating custom projections with Proj4

I'm reading into how to customise projections with Proj4 - specifically to achieve tilted projections such as the example below (from vis4.net) The Proj4 literature is pretty heavy going and having ...
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2answers
204 views

Adding Geographic Coordinate System and Projected Coordinate System layers

So I have two layers that I am adding into ArcMap. I know for a fact that when you added the first layer with Projected Coordinated System, the 2nd layer, which has a geographic coordinate system ...
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2answers
103 views

How do I transform a raster image to one with rounded corners (cylindrical to pseudocylindrical)?

I've been working with the altimetry data from topex.ucsd.edu/WWW_html/mar_grav.html Was having difficulties extracting the data, so I wrote a simple tool to do that. Creates a bitmap form the data ...
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1answer
76 views

Valid values of mollweide projection in QGis

i just imported a vectorlayer (without any reference points) to qgis as mollweide projection to save it to longlat. What i am wondering about is a mathematical problem: Not every x,y coordinate on the ...
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1answer
218 views

How to reproject data in multiple UTM zones? (DRCongo, Rwanda and Uganda)

I am working in the area near to Virunga National Park, in DRCongo, Uganda and Rwanda. I have established my working area in the zone 35 south. However, I also have to work with data from Uganda and ...
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1answer
248 views

Why doesn't LeafletJS complete the conversion when re-projecting to Spherical Mercator?

When I use the Mapbox Leaflet pre-packaged Projection class SphericalMercator to project a lat/long coordinate into EPSG:3857 I have to multiply the result Leaflet provides by the earth's radius. ...
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439 views

How to get a “classical” globe projection

I have a shapefile of the world continents in EPSG 4326. To what reference system do I have to reproject my file to get a projecting like this globe below?
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1answer
307 views

Why are map tiles being repeated? Using MapServer and Openlayers

Problem I have: map tiles from my layer are being repeated. Shapefile is projection 3059. I have specified 3059 is in the mapfile and also when creating map object. I know OpenLayers.Layer.WMS is ...
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1answer
56 views

How can i figure out to convert this points to latlong?

I got below data in sql server, Learned that data is collected under zone IIIa considering Lambert Conformal conic projection in India. The data is generated from Spatial Cadastre Software. Also ...
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1answer
226 views

Optimize openlayers / Geoserver 2.5 with GeoWebCache - reprojection necessary?

I have an openlayers map setup with several base layer options (some served by my own GeoServer) and many optional layers served by my own GeoServer. I've selected Google's EPSG:900913 as the map's ...
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1answer
143 views

Converting unknown type of coordinates to lat/lon

Our company is using Total Station (Surveying Machine using SOP) to calculate GPS coordinates and its results are something like this Easting: 3250193.00, Northing: 1115573.00, Elevation: 656.00 ...
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277 views

Reprojecting vector layer in OpenLayers

I have a simple OpenLayers map, where I would like to display the OSM map (the base map, in EPSG:900913) with some points on top of it (a vector layer, in EPSG:3763). I use proj4js. I do convert a ...
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1answer
774 views

Re-project raster image from Mercator to Equirectangular

I have a raster image of the world map in Mercator projection, square 1:1 format. I want transform the image into an Equirectangular projection accurately. I assumed from my research that GDAL would ...
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1answer
150 views

Azimuthal Equidistant - 40,000 Km range

I've been looking at making an azimuthal equidistant map. There are several web sites that offer to make one, based on my location, but they all have the same problem. They assume my antenna rotates ...
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1answer
151 views

How can I reproject a layer in pyqgis?

I have a problem. I'm currently trying to get the extent of a vector layer in latitude and longitude coordinates in python. The layer is currently in EPSG:3857, so .fullExtent() is not returning what ...
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28 views

Reprojecting basemap in arcgis 10.1 [duplicate]

Is it possible to reproject a basemap in ArcGIS 10.1 into a customized spatial reference (and if so, how ?) ? I want an OpenStreetMap basemap to fall into my local SR. Done some research on the ...
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1answer
66 views

Importing data into a project with a custom CRS incorrectly projected

I created a custom CRS for a project I am working on. I then started a new project, set to my custom CRS and turn on "on the fly" transformation. I import Rail data that I know is in my custom CRS, ...
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202 views

Point Layer WMS GetFeatureInfo failing when zoom in

I have a problem that i think is related with the interaction between OpenLayers and my Google map Base Layer (inconsistencies with coordinates systems, or something like that). Maybe also this could ...
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1answer
138 views

Reprojecting kml in NAD27, 83 or WGS84 using QGis

I have downloaded a kml file from Google containing location of shops. The coordinates in that file are in lat/long. I have other shp files containing roads and territories. I am trying to have all ...
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1answer
96 views

Can I automate State Plane to Lat/Lon conversion in CartoDB?

Reading this: How do I convert State Plane coordinates to latitude-longitude? but ... I'm using CartoDB and wondering if there's a straightforward way to convert New York-Long Island State Plane ...
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1answer
75 views

Why are some layers saved with custom CRS while others use the appropriate EPSG code?

I have a number of .shp's that I have converted from EPSG 4148 to CPNO27. Some have come out perfectly and others revert to EPSG 1000007. I have checked and the only difference between the two is the ...
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1answer
156 views

UK Ordnance Survey Code Point. Projection change (OSGB 1936 to WSG84)

I am trying to overlay CodePoint with Polygons onto leaflet JS. My current problem is converting the .shp file into the correct projection and a kml. If I open the shp file (using qgis) with the ...
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1answer
154 views

File size inflation normal with gdalwarp?

After using gdalwarp to project and align-to-grid (via -tap) a number of rasters I noticed that the output rasters were significantly larger than the original rasters. A fairly thorough web search ...
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254 views

Raster: mosaic first, or project first?

I have a thousand raster tiles in un-projected decimal degrees from which to build a seamless mosaic in a metres-based coordinate system. The final image will be about 70,000px by 50,000px. Which is ...
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2answers
516 views

Conversion of Latitude/Longitude to different map projection

I have two m*n matrices coming from a WRF-ARW simulation: one exclusively with longitude values and one with only latitude values. For both matrices I know the originatin projection (lambert conic ...
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1answer
336 views

Reprojecting in postGIS from 900913 to 4326. Wrong coordinates

I'm working with postGIS 2.1 I have a table called 'xacementos' created with the srid: 900913. I took the points coordinates from google maps and I want to convert them to SRID:4326 to show the points ...
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2answers
70 views

Historical maps as cylindrical projections

Objective: I want to overlay old, historical maps on top of Google Maps. According to Wikipedia, Google Maps uses a variant of the Mercator projection, a close relative of cylindrical projections. ...
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1answer
111 views

Why do MGI and WGS 84 data not line up in ArcGIS for Desktop?

When i reproject raster from MGI 6 zone to the WGS84 it makes a mistake (it is moved for 380 m )See example below: I know that the problem is in MGI 6 projection (it is not accurate),but I do not ...
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1answer
94 views

Why am I losing part of my raster when I reproject?

QGIS 2.0 Working with tiff raster file. Reprojections are in WGS84 Mercator. Here is my problem: I am trying to use buffers or urban areas to analyze light intensity on a raster layer. I want 30 ...
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3answers
1k views

How to reproject WGS84 to a metric coordinate system with own reference point in QGIS?

I have GIS data in EPSG:4326 consisting of 2D points, linestrings and polygons that are all close (i.e. less then a couple of hundred of meters) to a certain WGS84 coordinate point. I would like to ...
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2answers
829 views

How to Reproject a DWG file?

I've been asked this question by a friend of mine, and from my experience with Autocad (which is rather small), I can't remember if the software supports reprojecting layers from a projection/datum to ...
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0answers
62 views

Re-projecting WGS84 to OSGB in SAGAGIS

I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I ...
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1answer
71 views

Which projection: Map from South Tyrol (Italy)

I need to find out what projection this base-map has for digitizing the information that was drawn on it. It's from South Tyrol (South Tirol) in Italy. I have the following information: Title: ...
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1answer
315 views

Why is my longitude conversion from NY State Plane Coordinate System to WGS84 consistently off by 3.665 degrees?

I'm trying to convert coordinates from the NY State Plane Coordinate System for Long Island (zone #3104) to WGS84 using the GeoTools Java API. The latitude value is correct, but the longitude is ...
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3answers
195 views

Geotiff reprojection

I am new for GIS programming. I try to change geotiff coordinate system from epsg 32635 to epsg 4326. I used the following gdal command: gdalwarp -rc -s_srs epsg:32635 -t_srs epsg:4326 -dstnodata 0 ...
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1answer
158 views

How can I use the proj string in java code?

I want to do projection from UTM/oblique mercator CRS to WGS84. And I know the solution to use a proj.4 string in commandline like+proj=omerc +lat_0=51.4 +lonc=7 +alpha=-10 +k=1 +x_0=0 +y_0=0 +gamma=0 ...
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1answer
378 views

Add EPSG:3857 geometries to map using Leaflet

Right now Leaflet can only add geometries with latitude and longitude values onto the map. If we have a EPSG:3857 point, whose x=-11819829 and y=4200860, how can I add it onto the map? If this point ...
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1answer
2k views

How do I display latitude longitude data on a UTM map?

I'm relatively new to GIS, so I may use incorrect terms, but I'll try my best. I'm using ArcView 10. My current coordinate system information is as follows. I believe this is correct, as it is ...
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19 views

How can I tell the accuracy of coordinates conversion by cs2cs? [duplicate]

For example, when I try this: cs2cs +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +to +proj=tmerc +lat_ 0=22.31213333333334 +lon_0=114.1785555555556 +k=1 +x_0=836694.05 +y_0=819069.8 + ellps=intl ...
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0answers
192 views

How to generate bounding box based on tile numbers using slippy map tiles method?

Description: I am writing a map cache server for my company. I have to get input data based on tms standard and send a request to wms server to render and cache map files. I am using slippy map tiles ...
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1answer
138 views

How to provide a WFS in multiple projections

I would like to set-up an editable web feature service (WFS-T) for serving my geospatial data. The data tables are in a PostGIS database on the same server. For security reasons my server admin ...
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722 views

Reprojecting WGS 1984 Web Mercator (EPSG:3857) in Python with GDAL

I am reprojecting rasters in python using GDAL. I need to project several tiffs from geographic WGS 84 coordinates to WGS 1984 Web Mercator (Auxiliary Sphere), in order to use them later in Openlayers ...