Tagged Questions

A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane

learn more… | top users | synonyms (1)

2
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0answers
79 views

Projection declaration in dojox.geo.openlayers possible?

I am trying to integrate some maps of my own into the dojox charting demo and I had success in exporting a shapefile (externally, i.e. with my own parser) to the dojo JSON map format. The map is in ...
1
vote
0answers
79 views

adding WMS service to application ArcGIS JS api

I've got map in projection: 4326 (WGS-84) when I try to add WMS layers which is in different projection I always get connection timeout Do you know if I could change WMS projection to set it up ...
1
vote
2answers
199 views

What is the SRS code for Lambert Conformal Conic projection and GCS Everest Definition 1962?

I have a shapefile with Geographic Coordinate System is "GCS_Everest Definition 1962" and the Projected Coordinate System is "Lambert_Conformal_Conic". I want to add this shapefile in Geoserver. But I ...
1
vote
0answers
97 views

Adding X,Y data and viewing with existing shape file

Excuse me for a simple question. I have CSV files of X,Y data (in decimal degrees) that I want to add to a map and view with a shapefile of level III ecoregions that I downloaded from the USGS ...
2
votes
2answers
160 views

projection issues from ArcGIS to Qgis

I am pretty new to ArcGIS and Qgis. I have loaded some geometry data in Qgis from my postgres database, then I have also loaded the same data in ArcGIS. Then from ArcGIS i have created a shapefile ...
7
votes
2answers
312 views

Is the quadrilateralized spherical cube map projection the same as Snyder's cubic equal area map projection?

Is the quadrilateralized spherical cube map projection [1] the same as Snyder's cubic equal area map projection [2]? I know both are equal area polyhedral map projections ( ...
1
vote
2answers
215 views

How to calculate the surface using Lambert correction?

i'm using lambert conformal conic , so we have distortions along any given parallel , i would like to get the area used to solve this distortion. I have calculated the area using Shoelace formula , ...
3
votes
1answer
79 views

Projectionless shapefile with unknown source

I have a bunch of maps that are output from a land use model in .asc format, but none have a projection file associated. The person who originally ran the LU model is long gone, so I don't have access ...
3
votes
1answer
179 views

Get the geotransform in Mercator given a pixel size away from the origin

I have a radar image with the following information: The projection is Mercator (Mercator_1SP in GDAL) The projection origin is 0º lat 0º lon At a given geographic coordinates (e.g. lon=10º ...
4
votes
1answer
208 views

Problems with lat long projection

Hi this seems like it should be an easy problem, but its been giving me a headache. I have a .xls spreadsheet with about 60,000 rows. Most of them have Latitude and Longitude. I simply want to ...
3
votes
2answers
144 views

Converting lat lon into co-ordinates (in ft of m)

I have a set of latitude and longitude of a series of points which specific the trajectory of a vehicle. If I consider the first point as the origin (0,0), is it possible to convert the trajectory ...
10
votes
2answers
251 views

How to reproject raster from 0 360 to -180 180 with cutting 180 meridian

I have a geotiff raster image that has a coordinate system with longtitudes from 0 to 360. The horizontal center of the image is 180 longtitude. See image below: I want to transform it to EPSG:4326 ...
3
votes
1answer
149 views

How to reproject a raster to Winkel Tripel projection?

I'm trying to project a raster map (in ASCII grid format) from longlat to the Winkel Tripel projection. But I'm running into errors, for instance gdalwarp won't accept the proj-string. $ gdalwarp ...
3
votes
2answers
346 views

German coordinate system from Lat/Long

I have WGS latitude and longitude for data points near Munich and I'd like to use a grid-type coordinate system, like the Ordnance Survey grids in Ireland or the UK. What coordinate system do you ...
2
votes
1answer
125 views

What coordinate system is this?

I just found a dataset of trees in San Francisco, but I'm unable to determine the system used for the coordinates. Here are some samples: 5998894.045593,2119007.035323 ...
2
votes
0answers
54 views

Recommendations on universal projection API or algorithm for ArcObjects?

As asked on the esri forum here, we are trying to convert a geometry from any spatial reference to any other spatial reference. We have tried the default IGeometry.Project(target_spatial_reference) ...
2
votes
2answers
116 views

How to project US States in Transverse Mercator [duplicate]

Possible Duplicate: Layers having the same coordinate system should overlap, but they don’t. What’s wrong? I created two different MXDs, one for City of Tucson and another for US States. If ...
1
vote
2answers
318 views

Howto change OpenLayers BBOX request projection?

My map uses EPSG:900913 projection on the map. All coördinates in the database are stored in the 'normal' google format / GPS coordinates (WGS84). For instance, if you save a new location..Before I ...
0
votes
1answer
170 views

How to create a custom projection of PRS92 and UTM 51N for the Philippines? [duplicate]

Possible Duplicate: How to define new custom projections in QGIS? How do I create a customized CRS parameter in quantum GIS? I'm try to create a projection of PRS92 and UTM 51N. This ...
1
vote
1answer
884 views

How to Project shapefile from NAD 1983 UTM Zone 12 to WGS 1984 UTM Zone 13N?

I have a question and I have a shapefile that is in NAD UTM Zone 12 and Datum is North American Datum of 1983. What I would liket to reprojection it to NAD 1983 UTM Zone 13N and change the Datum to ...
2
votes
0answers
255 views

Help converting projection/coordinates to Google Earth

I'm trying to program a GPS style tracker for a simulation game but I'm having a hard time figuring out how to transform the game's coordinates into Google Earth's. The game's world is flat and has ...
1
vote
2answers
154 views

Recovering Latitude and Longitude from Albers to Compute Distance

I have a shapefile of U.S. counties in USA Contiguous Albers Equal Area Conic. I want to do distance calculations. For example, distances from one county to another. I do not know how to interpret ...
2
votes
1answer
56 views

What is the purpose of having a separate Layer property for sphericalMercator?

The Beginner's Guide to OpenLayers 2.10 says the following: sphericalMercator {Boolean} This property determines if the map should behave as a Mercator-projected map. Setting this to true ...
3
votes
1answer
148 views

Why are two incompatible projections used together in OpenLayers? [duplicate]

While going through the examples in OpenLayers, I notice several examples with the following code: map = new OpenLayers.Map('map_element',{ ... units: 'm', projection: new ...
2
votes
1answer
80 views

What is the expected margin of error for points plotted on EPSG:3857 projection?

I am using the projection EPSG:3857 to plot out points on the map. Since the Earth is closer to the shape of an ellipsoid instead of a sphere, I am interested to find out what is the range of error if ...
1
vote
1answer
492 views

Import GPX to QGIS with WGS84 [closed]

When loading a GPX-File in QGIS it is not referenced on WSG84. It´s shown with wrong coordinates. Settings are WSG84.
0
votes
1answer
124 views

Setting projection to a geotiff file when it's shown as Unknown

I have a geotiff file that has no CRS in the metadata but I know that the CRS of the raster is WGS 84 UTM 22 N. How can I modify the geotiff file to have the CRS WGS 84 UTM 22 N in the metadata. ...
1
vote
0answers
66 views

OpenLayers doesn't understand Mercator map measured in degrees?

I have access to a map server that takes a bounding box measured in degrees, and returns a map, projected in Web Mercator. I'm having trouble configuring OpenLayers to use a Mercator projection that ...
6
votes
1answer
106 views

Is there a difference between projecting shapefiles then rasterizing & rasterizing shapefiles then projecting?

I currently have a project where I rasterize shapefiles into simple presence/absence (1 & 0) rasters and then add each one to a running total to create a total richness raster at the end. The ...
4
votes
2answers
403 views

Create custom projection using either QGIS (or ArcGIS)?

I have searched for an answer to this but don't see anything relating to what I am trying to do. What I have are a series of Geographic Coordinates, Latitude, Longitude, Ellipsoid heights. What I ...
2
votes
1answer
380 views

OpenLayers Map with custom SRS (without EPSG code) [closed]

Is it possible to show geodata by OpenLayers in custom projection? I want to show my geodata in OpenLayers interface. Source layer(s): shape-file(s), standard epsg:4326 lon/lat projection; ...
2
votes
1answer
572 views

How to setup leaflet map to display a WMS layer in ESRI:102012 projection?

I have a WMS server that serves layers in ESRI:102012 projection. http://spatialreference.org/ref/esri/102012/ It accepts GetMap requests with srs=EPSG:102012 parameter. My goal is to display a map ...
1
vote
0answers
91 views

Project tiles from custom imagery in transverse mercator with OpenLayers

I have the following parameters of a custom imagery and I need to set-up a layer in OpenLayers with which I would project the tiles properly from this imagery. TransverseMercator ellipsoidName=WGS84 ...
3
votes
1answer
252 views

Overlaying layers with different projections on Android

Hello, I'm trying to show a map on Android. I'm using two map providers and am having trouble when converting geo point(lat/lon) to point in my viewport(x/y in pixels). 1) the first map provider used ...
10
votes
2answers
3k views

What's the difference between EPSG:4326 and EPSG:900913?

I am a bit confused on EPSG:4326 and EPSG:900913. I thought that they were both same. Though as I am placing my features over GMaps, which is EPSG:4326, I need to define the srsname of the WFS layer ...
4
votes
1answer
138 views

How to convert a png with known bounds from Plate Carree to Mercator with GDAL

I have a png image that shows the region defined by the geo bounds UpperLat, LeftLon, BottomLat, RightLon (in degrees & -ve for West Lon and South Lat) in Plate Carree EPSG:4326. I want to convert ...
2
votes
2answers
289 views

How do I import specific Coordinates from Namibia in QGis?

I have a map here with Coordinates from the Schwarzeck Map Datum Format 1903. They have the following format e.g.: y: 41 944,31 x:363 810,71 I want these point to be pictured in QGis... how is it ...
0
votes
2answers
812 views

How to convert projection

I got sample shape files with the following *prj file content: ...
1
vote
1answer
635 views

Mapping x, y pixel coordinates to latitude and longitudes on the WGS84 datum

Apologies in advance for the long question, I am fairly confused at this point and I figure if I show my thought process any flaws early on in the piece can be more easily pointed out. I have a grid ...
1
vote
1answer
121 views

Problems with matching layers with different projections

I have two layers with the following projections: Monte Mario IT1 UTM* Anyhow, I followed the instructions (open the project, set the projection, select on the fly projection, load the layers but no ...
0
votes
1answer
224 views

lonlat from geometry point gives strange result

I added a vector layer to my main map with the controls like the example from openlayers: http://openlayers.org/dev/examples/draw-feature.html Now when I want to get the resulting lonlat from the ...
1
vote
0answers
165 views

Get tile URL with projection different than 900913

I have the following code, which should display a slippy map showing tiles producted by me with mapnik: Proj4js.defs["EPSG:31258"] = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=450000 ...
3
votes
1answer
116 views

Problem in displaying a GeoTiff image in JMapFrame

I'm trying to display a GeoTiff image with no projection but where the geographical extent (bounding box) is known: reader= format.getReader(new File(sImageName)); GridCoverage2D gridCoverage= ...
2
votes
1answer
69 views

cannot reproject postgis in mapserver

I am trying to set up a wms server using point data in a postgis (v 1.5.1, pgsql v 8.4) database and mapserver (v 1.5.1) (I know these are not the most current versions of anything, but my server is ...
2
votes
2answers
264 views

Looking for formula for the Robinson projection

I'm looking for a source that describes how the Robinson projection is calculated. I'm going to use this for converting long/lat into Robinson coordinates in both R and in javascript.
0
votes
2answers
122 views

Why is my shapefile being displayed in the incorrect position? [closed]

I imported a shapefile from the following link http://geocommons.com/overlays/176. However, it does not import correctly. The data comes in as a "mini planet" in the middle of the US. I only know this ...
0
votes
0answers
219 views

openlayers, show wms layer and vector layer simultaneously [closed]

I trying to show with openlayers vector layer(from geoJson) and raster wms layer(*wms_layer*) from tiff file from my GeoServer simultaneously. The tiff is in EPSG:900913 projection. The vector layer ...
0
votes
0answers
216 views

XYZ map doesn't calculate the correct tile URL

I have the following code: Proj4js.defs["EPSG:31258"] = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=450000 +y_0=-5000000 +ellps=bessel ...
7
votes
5answers
808 views

Calculate distance in km to nearest points (given in lat/long) using ArcGIS

I have two point datasets in ArcGIS, both of which are given in WGS84 lat/lon co-ordinates and the points are spread across the whole world. I would like to find the nearest point in Dataset A to each ...
1
vote
1answer
231 views

OSM Map projection doesn't seem to change

I have the following OpenLayers map: Proj4js.defs["EPSG:31258"] = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=450000 +y_0=-5000000 +ellps=bessel ...

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