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

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723 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
131 views

Converting between wgs84 and nad83

This is a newbie question that is about converting between wgs84 and nad83. I have aerial photos that I am trying to compute lat long coordinates for as closely as possible. There are several factors ...
2
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2answers
55 views

Best Projection for Getis Ord Gi* Statistic Analysis

I am about to calculate the Getis Ord Gi* statistic for some rasters whose extents are global. In choosing a projection, do I want to preserve distance (e.g. equidistant) to obtain accurate ...
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1answer
22 views

How to project data into both a Vertical & Horizontal Coordinate System?

I have a shapefile whose Geometry is of POINTZM type. The XY coordinate System is NAD_1983_CORS96_StatePlane_North_Carolina_FIPS_3200_Ft_US and the Z coordinate system is ...
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1answer
337 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 ...
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1answer
125 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 ...
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0answers
24 views

How to define projection in ArcMap? [closed]

I don't understand why when i use the define projection tool in arc map with some of my shape-files, they disappear and even when i zoom to layer, I am not able to see them again. I have even tried ...
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0answers
34 views

Reverse parameters of a projection map

I'm user of a soaring simulator named "Condor Soaring". This simulator is at the center of a community of enthusiastic people who build sceneries (landscapes) which represents quite accurately real ...
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0answers
33 views

Identify coordinate system used near Kuala Lampur

I have some coordinates that were given to me, and I do not know much about how they were taken. I thought they were UTM coordinates, but when I try to convert them using some online tools I always ...
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0answers
28 views

Conversion of (lat, lon, height) from GPS to another CRS

I have latitudes, longitudes and ellipsoidal heights derived from GPS readings, referenced to the ITRF08 system with vertical datum (CGVD2013) - http://webapp.geod.nrcan.gc.ca/geod/hmod/hmod.php How ...
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2answers
208 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
162 views

Reprojecting elevation dataset for “tilted Earth”

I would like to create maps of a "tilted Earth", such as the following example where Australia is at the North Pole: http://i1048.photobucket.com/albums/s379/laskaris_mods/tilted_earth.jpg I can ...
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1answer
58 views

Issues with getting the height from SRTM gdalwarp WGS84(EPSG:4326) to Mercator(EPSG:3857)

I am trying to use the SRTM .hgt file to obtain the height of a location. My issue is that I wish to reproject the SRTM file from WGS84 to Mercator but the height returned is not consistent after ...
5
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2answers
1k views

Does anyone know the proj4 Coordinte Reference System command line for Rectangular Polyconic Gores?

I am a GIS beginner using QGIS 1.8.0 I am trying to transform a world map from the standard WGS84 Coordinate Projection System to a set of rectangular polyconic gores, with a gore count of 12. ...
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1answer
57 views

Misalignment of EPSG:4326 and EPSG:3399 coordinates

I'm having a QGIS project in local coordinates (Gauss-Kruger, EPSG:3399) with some layers in the same reference system. On top of that, I want to display point coordinates, which I digitized using ...
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1answer
43 views

Resolution problem

I have a Landsat TM image and in QGIS I used Clipper to crop my image. Then, I tried to reprojected it via Warp (Reproject) and the pixel size goes 29.9936,-29.9936. I do not understand why this ...
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3answers
121 views

Which UTM zone to use for a large country?

I want to reproject OpenStreetMap roads data from the current projection (WGS 84) to UTM, since I read in another GIS.SE discussion (How to get $length in meters in QGIS?) that WGS 84 cannot be used ...
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1answer
28 views

Layers with the same projected coordinate system and geographic coordinate system do not overlap [duplicate]

I have a blank map, I've set the data frame to the same projected coordinate system as the data I'm going to add. I have added one shapefile and it looks good. When I wave the cursor over the map the ...
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0answers
34 views

Change mbtiles projection with openlayers and proj4js

I've got mbtiles file whithin tileserver.php (klokantech) This file has got specific projection with in local coordinate system. +proj=tmerc +lat_0=0 +lon_0=49.05 +k=1 +x_0=2300001.7 ...
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1answer
35 views

change projection in an ascii (x,y,z) file

I am having an ASCII file (lat,long,depth) in the Mars projection. I need this file to be converted into WGS-84 projection. How can I do the conversion for the ASCII files.
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92 views

What projection system is used in China which is aligned with WGS84 [closed]

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 ...
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1answer
186 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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1answer
99 views

How is QGIS opening a shapefile with no *.prj file?

I was wondering how QGIS could open a shapefile with no *.prj file (for instance, let's say we have a shapefile with just *.shp, *.dbf and *.shx files). If the On the fly reprojection option is ...
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1answer
163 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 ...
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0answers
14 views

Precise aligning of two web layer

In Arcmap I add basemap from arcgis server (arcgisonline.com). On top of it I add another layer from a regional arcgis server which is in Bessel 1841 coordinate system. In this case Arcmap shows ...
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1answer
50 views

Adding points defined by Latitude and Longitude to map using QGIS?

I have an OS map on which I want to display points defined by Latitude and Longitude, but the map coo-ordinates have values I do not recognise or understand. The image shows the map, with my first ...
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1answer
33 views

How do I project a point stored as Lat / Lon to a state system?

I have some points stored as WGS84 (EPSG:4326) data. I want to write a SELECT statement to return the projected values, in EPSG:2811, and unprojected values. Here is my table SQL: CREATE TABLE ...
3
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1answer
44 views

Modifying straight line segments so they follow geodesic / great circle paths using QGIS

I have a kml file showing a dodecahedron stretched across the surfce of a globe, which I downloaded here: http://montalk.net/cgi-bin/coordinates.py I would like to re-project this dodecahedron so I ...
2
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2answers
35 views

MMQGIS:Create:Hub Distance: Output shapefile in wrong coordinate system

I have a QGIS-project that is completely in EPSG:31467 - DHDN / Gauss-Kruger zone 3. It consists of random points (camera traps) surrounded by a polygon (forest edge). I already converted the polygon ...
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1answer
274 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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0answers
36 views

OpenLayers 2: Transform the geometries for a list of feature objects

I am trying to export GeoJSON for a list of feature objects. The features are in EPSG:3857 projection and I would like to convert all geometries to EPSG:4326. I am perfectly capable of doing this by ...
3
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1answer
5k views

Transforming from SRID 900913 to 4326 with PostGis

I have two Postgres tables with different SRIDs: 4326 and 900913. I want to convert the latter to 4326. I first changed the SRID using: Select UpdateGeometrySRID('table', 'geomcolumn', 4326). I ...
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1answer
30 views

Ogr2ogr trying to import and convert shapefile to EPSG:3857

I'm attempting to import a shapefile (along with .prj file) to MySQL using Ogr2ogr and using the t_srs option set to EPSG:3857 (the default for Leaflet and Google Maps) but I'm getting odd results, ...
1
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1answer
805 views

GPS Coordinates to WKID 102100

I'm currently creating a project for ios and I'm using the latest ArcGIS IOS api. I have a mapView that is using the spatial reference skid 102100 and i am receiving lat long coordinates from an ...
3
votes
2answers
2k views

How to convert 6 digit latitude & 7 digit longitude to degrees

Sorry, but I'm a bit new to the whole GIS world, and though I am making great headway drawing polygons and such in Bing Maps, I am currently stuck. In our SQL spatial data, I came across MULTIPOLYGON ...
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1answer
48 views

Re-projecting ground control points of similar images (Georeferencing in QGIS)

I have several maps to digitize. The base maps were Canadian NTS map sheets, all for more or less the same region. The useful information has been traced on top with handwritten markings. The maps ...
2
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2answers
48 views

Batch reproject .tif and .shp

I need help changing this code to do: 1) Within a specified directory, reproject all .tif and/or .shp files to: NAD_1983_UTM_Zone_16N without needing to input what the old projection is. 2) If ...
1
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1answer
183 views

How to Buffer data in a Geographic coordinate system?

I am having an issue with buffer. My data is in Geographic coordinate system. I am trying to do a buffer of 600m and i am finding different results for each case, have tried thse so far: Map in web ...
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0answers
43 views

Erroneous location when converting from a GCS_WGS_1984 to UTM

I have a shapefile map of Belgium divided by cantons that I want to re-project in order to have units in meters and to be able to calculate distances. I know how to do it with ArcGIS Projection tool, ...
1
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1answer
46 views

Re-projecting point data using ArcMap

I've created a point data layer in QGIS using a .png image as a template. Of course the .png had no projection, and when creating the new shapefile I chose the WGS_84 coordinate system. Now, I need ...
1
vote
1answer
172 views

Modify CRS to match boundaries of shapefile

I have boundary data in WGS'84 lat/long and data in a custom generated CRS. The data in the generated CRS appears to be offset by a particular vector compared to WGS'84. I want to attempt to match the ...
4
votes
1answer
86 views

Why are raster z-values changed when reprojecting?

I have raster data with height values (z). When I try to reproject/warp the raster to Gauss Kruger 3, the z-values are changing (several meters). (The data is already GK3, but I have to reproject ...
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0answers
16 views

Reprojecting a ECW raster with fwtools [duplicate]

I have a ECW Orthophoto and i want to repoject it from 25830 to 23030 srid. I haven´t found a free software to do this but i heard of a command line utility called FWTools that could do the job. I ...
2
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1answer
46 views

How to reproject all geometries columns in a PostGIS schema

Is there's a way to reproject all geometries columns of a postgis schema given the same source SRID to the same destination SRID? Exemple : schema.table1 has 2 geometries columns geom and geom2 with ...
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0answers
40 views

Covert XYZ data to 2D raster

I have a data from terrestrial scanning (3D) projected to 2D plane but still in XYZ format available here: http://ulozto.cz/xYkfywxY/xyz-to-2drst-txt. Finally, my data are all on same plane, but ...
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2answers
44 views

How to project WMS layers from GCS_WGS_1984 to UTM ED50 31N using ArcMap?

I'm using a WMS service to open different layers. Specifically I'm using this link: http://w24.bcn.cat/WMSBaseGuia/request.aspx I have the following problem. When I open these layers with Arcmap, ...
1
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2answers
4k views

Converting from British National Grid (27700) to WGS84 (4326) to Web Mercator (102100)

I'm developing a web application that uses ArcGIS to display a map using JavaScript. We are holding all our data in MS SQL Server 2008 as Easting/Northing against the British National Grid. ...
0
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1answer
18 views

gdaldem hillshade stop working with new projection?

Parallel to gdalwarp `-te -5.8 41 10 51.5 -ts 1980 0` not working with mercator? , my hillshade works with lat/long input : gdaldem hillshade input.tmp.tif shadedrelief.tmp.tif -s 111120 -z 5 -az ...
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1answer
25 views

gdalwarp `-te -5.8 41 10 51.5 -ts 1980 0` not working with mercator?

I was working with native lat/log projection on etopo1: #donwload: curl -L -C - ...
2
votes
2answers
5k views

How to create custom coordinate system in ArcGIS Desktop?

I have a series of control points with xy coordinates in both NAD83 UTM and in a local grid. How can I go about creating a new projection file in ArcGIS 10 for the local grid?