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

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5
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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 ...
4
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0answers
34 views

How to unproject a UTM ESRI Shapefile over WGS84 extent boundaries

Background: I am working on a collaborative project in Python that uses GDAL/OGR to work with rasters and vectors. There is one function that attempts to project one ESRI Shapefile's coordinate ...
3
votes
0answers
22 views

Creating Projection/Datum TransvMerc/OrdSurvGrtBrit in QGIS?

I have Memory Map files QCT exported to ECW. The Projection/Datum is Transverse Mercator / Ordnance Survey Great Britain which is not mentioned in the list of Projections/Datums available. How can I ...
3
votes
0answers
302 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
392 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
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0answers
777 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
votes
0answers
459 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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69 views

In R: Convert from WGS84 lat/long to UTM and back again to WGS84 lat/long

I am looking for a way in R to project WGS84 latitudes and longitudes to a UTM grid and then convert the UTM coordinates back to the WGS84 latitudes and longitudes. I have found a number of ways to ...
2
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0answers
22 views

Building proj/pyproj projection string for local coordinate system?

I'm struggling to come up with a proj string for a local county coordinate system using pyproj. The system is defined as follows: Linear unit: International foot (ift) Geodetic datum: North ...
2
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106 views

Problem reprojecting LiDAR data using liblas

I have multiple lidar data sets and I am trying to reproject them using liblas. They are missing the coordinate system in the header information so I assign them an SRS using las2las --a_srs: las2las ...
2
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71 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
30 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
votes
0answers
79 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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0answers
98 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
votes
0answers
98 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
149 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
79 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
278 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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0answers
591 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
votes
0answers
223 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
984 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
103 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
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
votes
0answers
546 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
votes
0answers
575 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 ...
1
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0answers
19 views

How to remove projection in terminal from .shp file with valid .prj available

I have .prj, .shp, .sbn, .sbx, .shx, .dbf files where the content of the .prj file is the following: ...
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0answers
11 views

MapProxy with WMTS source and reprojection

I am trying to consume Lantmateriet's WMTS source with EPSG:3006 and convert that to iOS TileOverlay compatible (GoogleMaps compatible) tile server. I cannot get it working. Can someone check this out ...
1
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27 views

Retaining resolution of MODIS data while reprojecting using gdalwarp

Can anyone help me to use gdal(gdalwarp specifically) for reprojection? I am using it to reproject MODIS data : I originally have an hdf file - MCD43A4.A2005001.h08v05.005.2007351192333.hdf which has ...
1
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0answers
33 views

Projecting GeoJSON polygon object in python to calculate area

I have a script, written in python, that does many calculations - but one set of calculations hinges on determining the area of a polygon that I read in, in GeoJSON format. I can convert this object ...
1
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0answers
42 views

gdalwarp UTM Zone 1 to WGS84 - fails to transform

I have a global dataset consisting of tiles in UTM projection that I want to mosaic and therefore need to reproject to a common projection. Can I solve my reprojection error with options to gdalwarp ...
1
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0answers
37 views

How to test polar stereographic projection for a specific longitude intersection?

I'm writing a library that tests grids defined by map projections for intersections, and am running into an issue implementing the test for polar stereographic and rectangular projections - ...
1
vote
0answers
78 views

How to Import Circular Polar Orbit (HDF5) data into ArcMap with WGS 1984 Projection

I'm currently trying to retrieve data from http://smap.jpl.nasa.gov/data/ and use it in ArcMap. The issue is that the data is curved towards the poles and so the bottom left of the extent isn't the ...
1
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0answers
52 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 ...
1
vote
0answers
53 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
102 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 ...
1
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0answers
68 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 ...
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0answers
174 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 ...
1
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0answers
74 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 ...
1
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0answers
84 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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0answers
69 views

How to resample a DEM from GCS to UTM with respect to reprojection bounds parameter?

When reprojecting a DEM (e.g., SRTM-derived 1-arc DEM) using PCI Geomatica for example, to constrain pixel size and maintain a square pixel you can either change the image extent or the number of ...
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0answers
113 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
72 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
101 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
194 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
373 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 ...
1
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0answers
223 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
311 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
96 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
96 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 ...