The process of translating a map or spatial data from one geographic projection to another
4
votes
0answers
187 views
How can I improve my Georeferencing results?
Background This is my second question related to georeferencing naked raster maps in order to re-visualize them on different coordinate systems and in conjunction with other data layers. The previous ...
4
votes
0answers
143 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
votes
0answers
122 views
Bug in gdalwarp's simple nearest neighbor? Or more likely I need some help
I'm trying to understand how to use the GDAL utilities a little better. I think I've defined something incorrectly or I've found a bug in gdalwarp. My bet is that I've defined something incorrectly, ...
3
votes
0answers
50 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, ...
2
votes
0answers
253 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
votes
0answers
17 views
Crashing trying to warp map files
I have been trying to warp ECW and Ozfx3 map formats to GeoTiff format. I have navigated to Raster>Projections>Warp(reproject) I have then selected the file to warp the output that I want and ...
2
votes
0answers
63 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
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 ...
2
votes
0answers
136 views
Coordinate systems conversion
I have the following task.
This is my sample data.
WGS84 datum (longitude/latitude):
-123.75 36.59788913307022
-118.125 40.97989806962013
Spherical Mercator (meters):
-13775786.985667605 ...
2
votes
0answers
177 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 ...
2
votes
0answers
418 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
351 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
755 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
votes
0answers
505 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
vote
0answers
25 views
informations about “gdaltransform” utility of GDAL
I have a doubt about GDAL reprojection.
I use "gdalwarp" utility to reproject an image in a specific projection system (for example WGS84 UTM49).
"gdalinfo" on original image displays this corner ...
1
vote
0answers
45 views
Projection for Tracking a Vehicle
I'm looking for the best coordinate system projection to use for cartesian calculations while a vehicle is running from its starting location to about 100 miles from that spot.
The offline format ...
1
vote
0answers
121 views
Conversion between WGS84 height and local height datum
For x/y or lat/lon or heights between different ellipsoid, we can do conversion by using proj.4. But I found that if I want to convert between WGS84 height and local height, I found that it is not so ...
1
vote
0answers
80 views
Converting altitude in feet to pixels on a mercator map image
I know the question might seem farfetched given that the map is 2d. But I essentially want to project items-aircraft-above the map and I would like their altitude to be vaguely 'realistic' in terms of ...
1
vote
0answers
70 views
Raster on-the-fly projection in ArcGIS has different resolutions
I have a map document authored in ArcMap. The spatial reference for each of the raster layers is Alaska State Plane. If I set the Data Frame projection to Web Mercator (Auxiliary Sphere), then my ...
1
vote
0answers
62 views
How to reproject aqua modis images / ocean color?
I am working with aqua modis, ocean color, L2 - SST image but in order to do I must reproject it. I use the gdal_translate to convert the format of the image but reprojection is becoming very ...
1
vote
0answers
56 views
resampling errors
I have to reproject my images, but it contains some resampling errors. Any one has any idea on significance of resampling error. Are they neglectable? Is there any good documentation to refer to? I'll ...
1
vote
0answers
164 views
Possible to do a datum shift using dotSpatial?
I was hoping to be able to use Reproject.ReprojectPoints to achieve a datum shift between lat/lon values in NAD27 and NAD83. I'm able to correctly reproject from NAD27 lat/lon to NAD27 UTM and from ...
1
vote
0answers
136 views
On the usage of Proj4Js->tmerc.js
I am using "proj4js & open layers" for my mapping.
I got projection & datum (which is based on "Transverse Mercator") of a local plane and
this plane is part of a grid which returns ...
1
vote
0answers
237 views
Conversion From Transverse Mercator To Longitude & Lattitude
I have to transform (7-parameters datum transformation) coordinates from northings & eastings to lattitude & longitude.
Following are details of source coordinate system(i.e. northings & ...
1
vote
0answers
192 views
ogr2ogr failed to reproject shapefile error exceeds limits
I cannot get correct transformation from WGS84 to the Hungarian EOV EPSG:23700 (Hungarian Datum 72) using ogr2ogr.
I am using ogr2ogr from the fwtools shell. I have a shapefile in GCS WGS84 (epsg ...
1
vote
0answers
206 views
How do I use Proj4js or other technique to make custom map projections with google.maps.Projection?
I'm using Google's Projection class to try to convert my map projection from the default spherical mercator to something like Lambert Conformal Conic. I was previously adapting the code from this ...
1
vote
0answers
369 views
Converting Lon Lat to UTM Zone 32N in C# with SQLSpatialTools
I have a set of coordinates; Lon 9.42221521, Lat 56.44978001 and I want to convert them to UTM Zone 32N coordinates. I found the SQLSpatialTools library to do the conversion but I need some help. When ...
1
vote
0answers
115 views
Proj4js can't handle 90/180degree transformations from 4326
So if you try to do a transform like this
Proj4js.transform( new Proj4js.Proj( 'EPSG:4326' ),
new Proj4js.Proj( 'EPSG:3857' ),
new Proj4js.Point( -180, -90 ) ...
0
votes
0answers
12 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 ...
0
votes
0answers
12 views
How to snap Vector Layer projection to Raster layer projection in QGIS?
I have raster in correct projection. Then after i classified it in QGIS, i found out that my vector layers have different projection, so they have different size and position. Is there a way to ...
0
votes
0answers
18 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: ...
0
votes
0answers
60 views
Getting: org.opengis.referencing.NoSuchIdentifierException: No transform for classification “Transverse Mercator Zoned Grid System” with geotools
Using geotools I've been trying to create a referenced envelope after converting/reprojecting from WGS 84 to UTM with specific zones and it seems that either I need to do something with authority ...
0
votes
0answers
17 views
Is it possible to keep tiling and overviews when reprojecting in GDAL?
I have the following script to reproject GeoTIFFs to EPSG:3857 and retile and then create overviews.
#!/bin/bash
#reproject all ...
0
votes
0answers
38 views
project geotiff to NSIDC Sea Ice Polar Stereographic North (EPSG:3411) with gdalwarp
I a trying to project a signed byte .tiff file (sea ice concentration data) from a uniform unprojected grid (latitudes: -89.875° to 89.875° by 0.25°, longitudes:-179.875° to 179.875° by 0.25°) to ...
0
votes
0answers
98 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
votes
0answers
104 views
Why the georeferencing in UTM does not work with the QGIS georeferencer?
First time here, sorry if this looks simple.
I use QGIS on Windows 7. I georeferenced a toposheet with geographic references to UTM. When I superimpose a UTM raster, the toposheet is near the origin ...
0
votes
0answers
62 views
MapInfo - WFS service with multiple SRS codes?
I've posted to the mapinfo forum (https://groups.google.com/forum/?fromgroups=#!topic/mapinfo-l/HfA2zna9Rao) but hoping for better response here.
Will someone share an example configuration or ...
0
votes
0answers
163 views
Getting Latitude & longitude of a Mollweide projection
I am very new to geotools and map-projections and after researching a hole day I still don't know where to start.
I have a map with a size of X,Y Pixels and it is in Mollweide projection.
How can I ...
0
votes
0answers
295 views
How to convert map coordinates to lat long values in Lambert projection with WGS84 datum using Java?
I want to convert map coordinates values to latitude,longitude values. The image is in Lambert Conformal Conic projection with WGS84 datum, WGS84 ellipsoid. Please suggest to me the formulas involved. ...
