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

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4
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891 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 ...
3
votes
0answers
215 views

Formula for maximum coverage of a geostationary satellite based on earth station elevation

I am trying to create a javascript function to represent the maximum coverage of a geo satellite for different antenna elevations (0 degrees, 5 and 10 degrees) with 3 leaflet polylines. The result is ...
3
votes
0answers
240 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 ...
3
votes
0answers
631 views

Fortifying re-projected shapefile for ggplot2 in R

I have a shapefile of US county boundaries which I got from the NHGIS. I can load the file using the rgdal package and see information about it: library(rgdal) shp_1860 <- readOGR("shp", ...
3
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0answers
1k views

How do I solve Gdalwarp error 'too many points failed to transform' for remapping Geostationary to Lambert conformal?

I am trying to remap from Geostationary to Lambert conformal using gdalwarp. My input data is in netcdf, and is in geographic coordinates (degrees) and I would like to output the remapped data to ...
3
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0answers
66 views

How can I specify a spatial reference system which has a north pole different than the standard north pole?

I have a geographic spatial reference system (i.e., latitude and longitude) which has a north pole that is not the usual north pole: it's the magnetic north pole at approximately 70.30 degrees north, ...
3
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0answers
419 views

How do I pass a LatLng Bounds from Leaflet to Mapfish Print?

I successfully fired up a MapFish print server on Elastic Beanstalk, and it prints out the sample spec files fine, but I'm trying to pass bounds from my Leaflet frontend now, and encountering a lot of ...
3
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0answers
1k views

Converting projected coordinates to google maps pixels

I have a single polygon in a local projection system. I would like to convert that polygon into an image that can be used as an overlay on google maps. I understand that it may be better to use ...
2
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48 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 ...
2
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0answers
25 views

Error in Measuring distance using QGIS?

I am using the current Qgis 2.6.1 and having problems using the measuring distance function. The 'Measure Line' is giving me distances which is completely wrong and the scale shown was too big also. ...
2
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0answers
68 views

Help with Python/GDAL documentation

The instructions from the url http://gdal.org/gdal_tutorial.html give the following example: dataset = gdal.Open( filename, GA_ReadOnly) with the following description: It's interpretation is ...
2
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82 views

QGIS Problem with extract and warp modules in model builder

I have problems using the gdal modules extract and warp in the model builder. They run correctly when started without the modelbuilder, but when I integrate them in the modelbuilder they won't work. ...
2
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0answers
83 views

Clipping and reprojecting in one process for modelbuilder // “Save raster layer as” … in modelbuilder

I want to build a model in the QGIS Modelbuilder. First it should do a clip. Afterwards it should be reprojected (from Geographic WGS84 Coordinates to Gauss-Krüger). I only see one way to do this: ...
2
votes
0answers
102 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 ...
2
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0answers
69 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 ...
2
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0answers
229 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 ...
2
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475 views

Geoserver - empty native SRS field

I'm converting layers from shape files to postgis with the below command: shp2pgsql -s 22175 -c -W "latin1" path/file.dbf' table_name db_name | psql -d db_name Next, I add this layer to the ...
2
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0answers
172 views

MGRS square identifier to polygon

I'm looking for a function/formula/library that basically takes a MGRS square identifier such as 4QFJ16 and returns me the coordinates of the 4 corners of this polygon in some simple form such as ...
2
votes
0answers
871 views

Projecting point in Leaflet from EPSG 900913 (same as 3857) to EPSG 2232 with proj4js returning unexpected results

I have a leaflet map from which I want to be able to query an api that accepts x y values in EPSG 2232 as inputs. Leaflet doesn't handle point transformations like Open Layers does so I am trying to ...
2
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0answers
102 views

Proj4s.js Library Transformation Accuracy Documentation

I am using proj4s.js for transforming between coordinate systems for a GIS web application. Is there any documentation out there on transformations accuracy provided by the library?
2
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0answers
566 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 ...
2
votes
0answers
1k views

OSGB36 to WGS84 reprojection 'error'

First off, I am a recent convert to QGIS and am greatly impressed with its ease of use and speed compared with the ESRI products with which I am more familiar - my congratulations and thanks to its ...
2
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0answers
518 views

How to overlay geographic data from multiple sources?

Being a newbie to GIS, I am trying to create a map using shapefiles and addresses found online, as an exercise. The steps are below: I downloaded a shapefile of Connecticut from the following link ...
2
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0answers
570 views

OpenLayers WMS overlay tile projection

We are using OpenLayers for our GIS Application and we have base files from Ordinance Survey for UK maps. For creating WMS layers, we are generating tiles of 256 x 256 through Sharpmap Library but ...
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24 views

C++ Convert Lat Long to BNG with Proj.4

Im creating a plugin for VBS2. In the program I can output a grid in either LAT LONG,UTM or MGRS. I need to be able to convert to BNG. I have managed to create a TKinter application in python that ...
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0answers
26 views

Projections way off on data imported into QGIS?

I have elevation data as a .shp from the USDA ARS and Hi-Res Orthoimages (Mystery Projection (UTM 15N?)) from the USGS website as geoTIFFs (plain NAD 83). I am trying to project all of the images ...
1
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0answers
68 views

extract x-y from a point created from lat/lon coordinate

Using QGIS 2.8.1, how can you create a point in WGS 84 using a lat/lon and extract X and Y value of this same point in CRS UTM34N. For eg, you have been given a lat 20 deg and lon 50 deg. Create a ...
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31 views

Precision of conversion from WSG84 to ECEF and ECEF to ENU?

To convert from a global to a local coordinate system, I apply the following transformations. WSG84 to ECEG: with and ECEF to ENU: Let's assume that the semi-major axes a and e are known ...
1
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0answers
100 views

lat lon to ease-grid 2.0 using proj4j

I’d like to use PROJ4J to project wgs84 lat lons to the Equal-Area Scalable Earth (EASE) 2.0 Grid. It seems the EASE 2.0 grid uses the Behrmann projection which is just an Cylindrical equal-area ...
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0answers
45 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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57 views

Unknown coordinates in Shapefile, projecting doesn't give expected results

I'm reading a Shape file (four files actually, .dbf, .prj, .shp and .shx) containing polygons representing certain areas in my neighborhood. For this I use C# and a library called DotSpatial. I can ...
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93 views

Reprojecting a population raster from LAEA to lonlat

I have a population density raster from the EEA which is based on the CORINE land cover 2000 data. ...
1
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0answers
53 views

How to shift a CRS by an observed offset

I have a drone image is which is geo-referenced over a Google Sat. image. These align well, and both use WGS84-Pseudo Mercator (EPSG:3857). I have a set of data points in a shape file which are ...
1
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0answers
64 views

Reproject xy tiles from mercator to Gauß-Krueger in ubuntu terminal

I´ve exported a map from tilemill as mbtiles and converted them to xyz tiles with help of mbutil. The tiles should be used (for learning purpose) with mod_tile or geoserver and displayed in ...
1
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0answers
127 views

Why does this Geotools Java reprojection to WGS-84/4326 cause offset?

I am using the block of code below. I am reading in a geotif with a UTM zone projection and converting it to 4326. I am pulling out certain multiband values and creating a new raster, when I plot the ...
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0answers
141 views

Assign CRS to shapefile in R

I imported my shapefile dat to R with readOGR, coordinates are given in easting and northing, I'd like to change it to latlon and tried: dat_latlon <- spTransform(dat, CRS("+proj=longlat ...
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0answers
125 views

gdalwarp with NETCDF files

I have been looking for it for a while but couldn't find what exactly I need. I have WRF outputs in NETCDF format and I want to convert them to Geotiffs with gdalwarp. I think my -s_srs should be ...
1
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0answers
206 views

Importing kml google earth polygons to QGIS

I've created some polygons in google earth, saved it to kml and then I loaded these files into QGIS. The problem seems to be the projection, these polygons are slightly out of the place. I've tried ...
1
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0answers
68 views

Braun/Gall projection and pixel conversion

I am fairly new to projection mathematics and I usually manage to get things to work with copy-paste and trial-and-error but this time I'm lost ... I am trying to map latitude (-90 to 90) and ...
1
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0answers
66 views

Mapping from one plane on the other plane despite of masking regions

have a set of data given here, where in the first and second columns there are the sky coordinates (ra,dec) e.g. right ascension and declination, respectively and in the third and forth, the ...
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0answers
54 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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0answers
108 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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0answers
89 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
vote
0answers
90 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 ...
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0answers
199 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 ...
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0answers
93 views

Gauss-Krueger coordinates in Openlayers

I want to show the coordinates of my map in gauss-krüger coordinates, but nothing works. I tried another projection, displayProjection, lonLat.transform but the answers are the same. my source ...
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0answers
143 views

Am I correctly projecting a geometry using a WKID in ArcObjects?

I would like to take in any valid WKID for a spatial reference and then project a single geometry to it. The following code seems to be working, but (1.) can someone verify that this is the correct ...
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0answers
138 views

How to convert MODIS (Vegetation Continuous Fields - MOD44B) to (.img and hdr) in ENVI

Please can anyone help me to convert MODIS (Vegetation Continuous Fields) to (.img and hdr) formats? In ENVI, anytime i try using the MODIS conversion toolkit, a dialog box appears telling me to ...
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0answers
50 views

Create oblique projection?

bit of an odd one which isn't necessarily package-specific. I'm trying to make a tshirt with a map section centred on the plane between San Francisco, USA, to Galway, Ireland. The Great Circle line ...
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384 views

Reprojecting GeoTIFFs to WGS84/UTM

I'm using libgeotiff and proj4 to read and (try to!) process GeoTIFFs. After reading the file, I want to get the corner coordinates in WGS84/UTM - but there are so many functions and parameters to try ...