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

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1answer
100 views

distance difference in Google Earth with exported GPX or KML compared to source shapefile

I've converted a shapefile (points) to KML with QGIS. Points in the shapefile are within 100m distance from each other. When I measure it in Google Earth, the distance changes to 80m. The same ...
2
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2answers
90 views

Reprojecting Natural Earth raster into natearth projection with gdalwarp causing black squares?

I'm trying to reproject the Natural Earth 2 raster layer (http://www.naturalearthdata.com/downloads/10m-raster-data/10m-natural-earth-2/) into the natural earth projection ...
1
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2answers
589 views

Calculating bounding box coordinates based on center and radius

I need to calculate a bounding box for osm query. I get coordinates of center of the area (WGS84) and radius (meters). How can I do it? I though about using some kind of projection, calculating ...
3
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1answer
23 views

Lambert_Conformal_Conic: converting from shapefile to geojson fails

I have a shapefile that also contains a proj file that looks like so: PROJCS [ "MGI_Austria_Lambert", GEOGCS [ "GCS_MGI", DATUM [ "D_MGI", ...
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1answer
27 views

Converting WGS84 points to a 2D x,y point (plotting)

I have been trying to convert the WGS84 style geo-positions to x,y coordinates on a 2D plane. I have looked into many different links, websites, studies and I honestly gave up on finding a plane copy ...
2
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2answers
46 views

Help projecting Austria data with QGIS

I'm trying to reproject this dataset from Austria Statistik Geodata. Data comes in "MGI_Austria_Lambert", and I'm trying to reproject to WGS84 What I'm doing is Saving layer as... and selecting ...
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0answers
25 views

ArcGIS Change from projected WGS84 to Geographic WGS84 [closed]

How do you do this? Running version 10.2.2. I believe it may be a tool in ArcToolbox but I do not know which one if it is.
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2answers
55 views

Mercator: scale factor is changed along the meridians as a function of latitude?

"In Mercator projection the scale factor is changed along the meridians as a function of latitude" How to calculate the Mercator scale factor as a function of the latitude in decimal degrees ? ...
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1answer
47 views

Pyproj: converting WGS84 to Robinson

I have a WGS84 coordinate pair (37.7749295, -122.4194155). I have an image that is a Robinson Map Projection of the world. I'm trying to write a python script to locate my WGS84 coordinate on my ...
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1answer
80 views

Lambert Conformal Conic Projection Inverse Transform after Fitting Ellipse to Noisy LLA Data

I'm using Python and Basemaps to convert some Lat Lon data to the LCC projection and back again. Since it is noisy data representing the footprint of a satellite, I am filtering it and fitting an ...
4
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1answer
266 views

NAD83 and NAD83 State Plane

I'm struggling with a projection question. I have some data in California State Plane and am trying to align a NED with NAD83. I thought these would just natively align, but they don't seem to ...
3
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1answer
49 views

Coordinate conversion (EPSG:3857 to EPSG:4326) using OpenGIS/JTS too slow

I am using the Java based libraries of OpenGIS and JTS to convert coordinates from EPSG:3857 to EPSG:4326 to proceed to compute the distance using the Haversine formula. The distance features in a ...
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2answers
67 views

Converting from different projections to WGS84 Web Mercator Auxillary Sphere

I have multiple datasets in my ArcGIS, each having different map projections. All of them are vectors. Some are using Sphere Mercator, others using WGS84. I cannot perform the reprojection function in ...
1
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1answer
35 views

Coordinate System changes after reprojection

I have changed the projections of some Natural Earth Shapefile to "WGS 84/Pseduo Mercator", that works fine (after cutting out the artic), but now the co ordinates of the shapefile are all out of ...
0
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1answer
184 views

Orthographic reprojection with mapnik

I am trying to create a google earth like wep application. My problem is that I can't get to render a full view of the earth. The zoom_all() function generates the following error : RuntimeError: ...
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1answer
55 views

How do I convert Geo-Coordinates to Pixel-Coordinates on a Map?

I have an image file that is a Robinson Projection Map of the world. I have a list of geo-coordinates. I would like to find the pixel-coordinates on the map that correspond to my the geo-coordinates I ...
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0answers
29 views

Vector seems to be only a pixel of a raster after reprojection

I have the South America hydro1k data for slopes and I am trying to extract the data using point sampling tool with a grid in Brazil's map. My problem is that, even though vector and raster seem to ...
1
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1answer
85 views

How to reproject from Clarke_1880_RGS_Lambert_Conformal_Conic to ETRS_1989_LAEA?

I am unable to reproject Marseille shapefiles from Clarke 1880 RGS_Lambert_Conformal_Conic to ETRS_1989_LAEA. I know that Clarke is a geographic coordinate system and it has no datum. I have tried ...
2
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1answer
333 views

How to re-project the EASE (Equal Area Scalable Earth) grid with a ~25 km cylindrical projection to WGS84 0.25 degree?

I have nc files ,here is one file https://echange-fichiers.inra.fr/get?k=LUfqiyO1Dl7az5bihnS. from the metadata ,the projection is cylindrical and the resolution is 25 km: ...
0
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1answer
220 views

How to transform/convert Coordinate Reference System with Proj4 and php

Basically my question is: Can I combine the functions of proj4 with php in my server? For example, I would like to know if it is possible get data in WGS84 and transform in ETRS89. I need to get ...
3
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1answer
32 views

QGIS: Plot a layer given with Longitudes [0 360] to [-180 180]

I have a world map in correct Longitudes from -180° to 180°. Additionally, I have a shapefile of data from South America, which shows at 290° instead of -70°. How can I reproject it using QGIS?
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0answers
19 views

What projection system is used in China which is aligned with WGS84

I have some GPS tracks in Beijing. I want to project it and convert the lat long degree values in meters for calculation in euclidian space. I was wondering what is the most suitable coordinate and ...
20
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4answers
14k views

Layers with same coordinate system should align/overlap but do not?

I put 4 different layers into my ArcMap document, but only one of them will show up on the map! I should be seeing the other 3 layers as well. When I do a Zoom to layer, I can see one layer, but I ...
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1answer
24 views

Projecting INEGI shapefiles from Mexico - not lining up [duplicate]

I have two INEGI shapefiles from Mexico (2000 and 2010) that I want to line up with one another. The 2010 file projects in the right location and I would like the 2000 file to match/line up with the ...
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2answers
374 views

GDAL/proj4 equirectangular projection coordinate system units assumed by OGRSpatialReference and GDALDataset::GetGeoTransform()?

How do I configure my OGRSpatialReference object to specify an equirectangular projection system http://en.wikipedia.org/wiki/Equirectangular_projection where the affine geo-transform matrix (provided ...
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1answer
77 views

Is it possible to reproject KML using ESRI's Silverlight API?

My question is similar to this one, but for Silverlight. I need to reproject an entire KML file to NAD83, add it to the map with all the layers, symbology, etc. in tact. Is there anyway to do this ...
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3answers
2k views

How to convert projection

I got sample shape files with the following *prj file content: ...
0
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1answer
36 views

What projection to use with Mapbox base/reference layers?

excuse me if this has been asked before, but I can not find answer after heavy googling. What coordinate system/projection does shapefiles need to be in to be alligned correctly with mapbox reference ...
2
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0answers
35 views

What C/C++ libraries exist to transform vectors between map projections

Has anybody written a C/C++ library (preferably one that is aware of Proj.4 definition strings) that has a set of routines to convert vector quantities (e.g., wind speed and direction) between map ...
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0answers
32 views

Creating a marker proportionally offset along a line in QGIS 2.4 when re-projecting

One of the nice new features in QGIS 2.4 is to be able to offset markers (e.g. arrow heads) along a line as part of the styling. I am trying to display a dataset of simple lines (not polylines) with ...
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1answer
45 views

Projecting INEGI shapefiles from Mexico

I have two INEGI files from Mexico (1990 and 2010) that I want to use the same projection. The 2010 file works fine (see below) and I would like the 1990 file to match the 2010 one. The shapefiles are ...
0
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1answer
30 views

Holes between imagery tiles projected using gdalwarp

I am having the following issue when reprojecting imagery tiles using gdalwarp. These are 4096x4096 imagery tiles, which I'm gdalwarp'ing from WGS84 to a State Plane projection. When reprojected, ...
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0answers
19 views

Misalignement of the Corine data set after reprojection with gdalwarp, nodata not working either

I want to reproject the original corine data set with a resolution of 100x100m. I am using gdalwarp: $ gdalwarp -overwrite -s_srs EPSG:3035 -t_srs EPSG:32632 -tr 100 100 -tap -wo "SAMPLE_GRID=YES" ...
0
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1answer
32 views

Coordinate extraction in a different projection in MapInfo

I have a .TAB file of polyline objects in British Grid Coordinate. I need to extract the end points/nodes of each polyline and find their latitude/longitude (WGS84). Would really appreciate some ...
0
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1answer
71 views

QGIS to solve projection mystery in Postgresql

I downloaded some data from local agency. Per QGIS 2.2, I defined the projection to 'EPSG:3587 - NAD83(NSRS2007) / Michigan Central' in postgresql (maybe ArcMap). Data is in Postgresql 9.3. I am ...
0
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1answer
126 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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0answers
46 views

Why can't I reproject from HARN State Plane Ft Intl to State Plane Ft?

I'm attempting to reproject a feature class that is: NAD_1983_HARN_StatePlane_Oregon_North_FIPS_3601_Feet_Intl to our standard, which is: NAD_1983_StatePlane_Oregon_North_FIPS_3601_Feet When I ...
1
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1answer
29 views

Raster projection fails without error

I have a raster in one coordinate system (SC State Plane NAD83 NSRS2007) and need to project it to another (SC State Plane NAD83 HARN). When I run Project Raster, it fails silently: the dialog box ...
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0answers
31 views

Geodjango transform introduces large errors

Apologies for the possibly naive question. I'm trying to understand how Geodjango (running on PostGIS) deals with coordinate transformations, and am experiencing some unusual behaviour. Let's say I ...
2
votes
3answers
360 views

Coordinate System (Malaysia RSO Projection) not lining up in QGIS and ArcGIS for Desktop?

I am using QGIS 1.9.0 on Linux Mint; and I am new to (Q)GIS I have three layers (2xshapefiles, 1xopenlayer[Bing Maps]) that I am trying to line up located in peninsular Malaysia. Shapefile_1 is a ...
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2answers
51 views

OpenStreetMap Tile Server with Custom Projection Systems

I am trying to install the OSM tile server on a local machine with a custom projection system like epsg:3573. For the server installation I followed this tutorial ...
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3answers
165 views

Copy>Paste from meter to feet coord-sys, and coordinates don't change in ArcMap 10

My dataframe coordinate system is in UTM with linear unit Meter. If I have a Polygon shapefile in a UTM coordinate system with a linear unit of Foot_US and I am sent a shapefile in the same UTM ...
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3answers
1k views

How to unproject WKT to WKT in .NET?

I have WKT in this format: GEOMETRYCOLLECTION(POLYGON((491990.250718 6212873.59755,491492.160493 6212904.94117,491265.64715 6212790.54445,491319.517251 6212550.36334,491579.624164 ...
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0answers
52 views

Conversion problem of projection of MODIS LAI from sinusoidal to geographic

I am trying to change MODIS data's (LAI) sinusoidal projection to geographic. Actually I did it. But when I reproject it by ERDAS, the output LAI raster moved about 10 km to west side of actual shape ...
2
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1answer
61 views

How to convert to web mercator projection using an open source tool?

I've got a KML file which I need converted to a web mercator projection. This file will go into Tilemill. What are some good open source tools to convert files to the web mercator projection?
2
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2answers
55 views

How do I convert to EPSG:3857 with GDAL?

I have some TIFs in EPSG4326 the GeoTiff info looks like: GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], ...
2
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1answer
116 views

Wrong projection high quality shapefile for the coastline of Helsinki region (Finland)

I did some spatial interpolations in R and I need a support for those. Looking for shapefiles online the best I could find was and it looks really horrible, the same area in ggplot looks like . I ...
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0answers
22 views

Changing original source projection

I am attempting to match up 2 raster layers, both a OS survey map and some independent survey data. The map I know to be in the correct position, However the survey data shows a layer extent of (layer ...
0
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1answer
65 views

projection conversion from mercator to google maps format

Is this spTransform(Finland3, CRS("+proj=longlat +ellps=WGS84 +no_defs+ellps=WGS84 +towgs84=0,0,0 ")) the right way to project a shapefile with this projection coord. ref. : +proj=merc +lon_0=0 ...
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1answer
56 views

Map project a raster having separate latitude and longitude raster bands

I have a satellite image where one of the channels is a raster having the longitude values, another channel a raster containing the latitude values. What would be the best way for map projecting such ...