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

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How to deal with different projections in PostGIS spatial analysis?

I am doing something wrong, but try as I may, I can never seem to grasp all aspects of how to project layers in GIS. I am working with two files: 1) The USGS maintains a list of locations with ...
3
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1answer
92 views

Rotating ~90° using Two-Point Equidistant projection with Proj4

I'm trying to rotate a tif raster in R using Proj4's Two-Point Equidistant projection - I think the only way to rotate spatial geometries to custom angles. But I'm finding the operation gets very ...
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68 views

Reprojecting a raster file in R

Help! I have a number of rasters from different sources with different projections. I want to reproject the rasters into a common projection (Eckert IV), somehow line the grids up, and then overlay ...
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24 views

Cordinate System Conversions

I have my council installations all in GCS WGS84 but they where mapped in Arc 50 coordinate system. When I display them on my Arcmap they do not coincide with the other layers such as roads and ...
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33 views

Where can I download a world shapefile with 180-degree central meridian?

Does anyone know where I could download a world shapefile that has a projection with a central meridian of 180 degrees longitude? I have found the following question that provides instructions for ...
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33 views

transformations from a sphere using R for raster and polygon data [duplicate]

I am planning on using the MODIS burned area products which were produced by Maryland University. These come as either polygons or rasters. In the user guide it says A shapefile version of the MCD45 ...
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1answer
42 views

ProjNet Nad 27 to WGS 1984 Results Incorrect

I'm fairly new to the ProjNet library and GIS in general so please bare with me. I have a set of coordinates from a EPSG:32038 system and I'm trying to convert to decimal Latitude and Longitude (WGS ...
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1answer
46 views

projecting onto Cartographic coordinates using Gauss Conformal Mercator in python

The shapefiles and boundaries I work with are on WGS 84 referenced to SA: GEOGCS["WGS 84", DATUM["World Geodetic System 1984", SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]], ...
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100 views

Getting inaccurate results converting from New York State projection to NAD83 with Python's pyproj

I've been trying to do a standard coordinate translation between New York State Long Island (ESRI:102718) and latitude/longitude (EPSG:4269)...but I keep getting the wrong lat/lng results. I don't ...
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33 views

How to read info from the CRS? [duplicate]

I'm struggling to understand how the geo projections work in practice. The info a the CRS is as follows: {'ellps': 'WGS84', 'no_defs': True, 'proj': 'longlat'} Does it mean that the coordinates are ...
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81 views

Datum and transformation error using ST_Transform in PostGIS, going from NAD83 to NAD27

I created a function in PostgreSQL to transform input coordinates using UTM Zone 12/13, with Datums NAD83 or NAD27, to the WYLAM projection. I had to manually create the entry for the proj4text ...
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54 views

Reproject non-earth to ITM/ICS

I'm trying to convert MapInfo, non-earth projection, layers with data in ITM or ICS (Israel coordinates in meters). When I do so through Universal Translator with converting to SHP and back again, ...
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76 views

Crop raster based on another raster R

library(raster) How can one clip one raster based on another raster? RasA: class : RasterLayer dimensions : 459, 533, 244647 (nrow, ncol, ncell) resolution : 10000, 10000 (x, y) extent ...
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44 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: PROJCS["S-JTSK_Krovak_East_North",GEOGCS["GCS_S_JTSK",DATUM["D_S_JTSK",SPHEROID["Bessel_1841",...
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60 views

Change raster projection in R

I'm trying to change raster projection using R and its raster library. The input raster projection is Lambert Azimuthal; this one and other params can be seen here: http://esdac.jrc.ec.europa.eu/...
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56 views

Why is the project tool in ArcGIS (ArcMap) for desktop throwing the “invalid geographic transformation” error?

I'm trying to reproject a point shapefile from ITRF92 to WGS84 UTM ZONE 14 NORTH. On the geographic transformation input field, I copied and pasted the following geographic transformations from the ...
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1answer
95 views

Difference in EPSG:28992 (RD/Amersfoort) definitions

I need to do some projections between WGS84 (EPSG:4326) and the Dutch RD system (EPSG:28992) in JavaScript. I use Proj4js for this. When adding the definition from spatialreference.org I noticed a ...
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500 views

Does transforming to a new projection, then back, affect data accuracy?

I have a feature class (South Carolina counties, so a fairly large geographic area) in NAD83 SC State Plane. It needs to be transformed to a second projection (NAD83 UTM 17), then transformed back to ...
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1answer
54 views

Arcobjects Assign projection transformation to layer file in VB.net

I want to be able to transform a layer from WGS1984 to OSGB1936. I created a tool that extracts layers from several folders on our company network folders, using check boxes that user clicks. One of ...
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1answer
172 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 ...
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145 views

TileStache Vector Tiles Overlay problem

I am using TileStache to serve my own vector tiles using a postgis datasource. First I re-projected the shapefiles I had using ArcMap ( reprojected to Web Mercator (Auxilary Sphere)) and loaded them ...
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2answers
69 views

How to convert bbox when importing GeoTIFF with Geotools?

Here is my code: String EPSG4326 = "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,...
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1answer
39 views

Plot image on map based on corner coordinates

I have a color image and I know geographic coordinates of its 4 corners. Now I'd like to place this image on basemap in GMT using any projection. Any idea how to do that?
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78 views

How to re-project a shapefile to be compatible with another shapefile or raster?

I have a polygon shapefile and a raster. The shapefile and raster have different coordinate systems. Coordinate System for the shapefile: NAD_1983_UTM_Zone_19N WKID: 26919 Authority: EPSG ...
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57 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 ...
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40 views

How to describe a MODIS Tile's distortion

When looking at the MODIS grid [1] and compare it to how the sinusoidal projection is distorted, I wonder how to both practically and formally describe the distortion factor for each MODIS grid tile. ...
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44 views

Defining the correct AEA proj4string for FEWSnet Rainfall Data (Southern Africa) in R [closed]

I have some general questions about how to go about solving this problem: I am trying to incorporate FEWSnet's monthly Rainfall Estimate data from 2014-2015 for Southern Africa into an analysis where ...
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1answer
57 views

Reprojection issue from WGS84 to UTM32

In QGIS I want to transform a point shapefile from WGS84 to UTM32 (EPSG:4647). The result moves the point from somewhere in Norway to a position off the coast of Congo, Africa. Can anyone explain what'...
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2answers
77 views

Inferring lat/lon based on known location coordinates

I have a point dataset with a set of coordinates that is in an unknown projection. For some of these points I know the unprojected latitude and longitude. Based on these known data points, would it be ...
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33 views

'Fix' offset and undersized data in QGIS

I'm currently working on a project to visualize some climate data, among the datasets I'm using is the data from the NCEP/NCAR Reanalysis Project. Now, this data comes in a regular (non-gaussian) ...
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2answers
105 views

ogr2ogr of NTF_Lambert_II_etendu is off by about 30 meters

I am converting RPG files in NTF_Lambert_II_etendu to wgs_84 using: ogr2ogr -t_srs EPSG:4326 ilot_2008_027_wgs84_2.shp ilot_2008_027.shp but the result is off by about 30 meters. Surprisingly, the ...
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2answers
123 views

What is a suitable map projection for the entire state of Idaho?

I am working with some sample GIS data for Idaho. The data is in geographic coordinates but I want it in projected coordinates. I am unsure how to address the issue of projection as Idaho crosses ...
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1answer
49 views

How to use Prolong Line feature with an input layer in WGS84?

I have a source point table in SRID:4326, and to make it look geographically accurate, I project my project file to SRID:2877 (State Plane CO) (layer still reports source CRS of SRID:4326). In order ...
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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 ...
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195 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 ...
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91 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 ...
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1answer
136 views

Do I need to reproject a NAD83 raster (with no projection) before using it with a shapefile that has a specific NAD83 projection?

I am relatively new to using ArcMap, so I apologize for what I guess is a relatively easy question. I working with a gridded PRISM precipitation raster (www.prism.oregonstate.edu), which has a ...
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2answers
66 views

Displace Lat/Long by meters

Sorry for the inflammatory title, Yes, I know these cannot be added. Problem: I have a vehicle that is reporting LL84, coordinates. It has a sensor that reports footprints of obstacles (LineString, ...
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27 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 ...
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1answer
30 views

Project to NAD83 (epsg:26912) with projectRaster - gives epsg:2152

I am working with some Landsat 8 images from the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center. I am processing the images in R, and after masking the clouds, I ...
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1answer
72 views

How to make two layers with different CRS line up correctly?

I have an Excel Table with Lat/Long information. Its lat/long of this coordinate System: UTM zone 29n My population density map instead is this coordinate system: UTM WGS84 Example: Barcleyville: ...
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1answer
126 views

Using Proj.4/GDAL to convert lat,lon to i,j

I'm working with a data set in GRIB2 format and need to determine the grid cell index (i, j) corresponding to a given lat,lon. I have the projection definition in the form of projparams as follows: {...
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3answers
103 views

Converting GeoTIFF projection definition to proj4

I'm working with las/laz files which often have GeoTIFF information attached to them. However, for further processing I need proj4 definitions. http://spatialreference.org/ has helped me so far to ...
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48 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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1answer
64 views

gdalwarp leaves big hole at 180° longitude when warping from 4326 to custom AEqD

I'm trying to reproject the Natural Earth I 1:50m raster into an Azimuthal Equidistant projection centered on my hometown. As you may know, the source raster covers from -180° to 180° latitude, and -...
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94 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 ...
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1answer
117 views

Converting x,y on mercator to WGS84 latitude and longitude

How do I convert a particular point on a Mercator map (points in a Mercator map svg) to WGS84 coordinates? Is it simply a direct translation of the x,y values, using a multiplier which matches the map ...
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1answer
216 views

Is re-projection needed from SRID 4326 (WGS 84) to 4269 (NAD 83)SRID

I have US census data against state boundaries stored as SRID 4269, in an MSSQL DB. The input data used for calculations against that dataset is stored as SRID 4326. As far as I can infer from the ...
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13 views

StreetDirectory API: metricToGeo returns undefined

I am currently implementing the SD API and am trying to convert their x and y coordinates into lat and long. I only need the static values and this is how I implement it: <script type="text/...
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120 views

Reprojecting MODIS NDVI and reading the hdf output file in ENVI

I'm working with ENVI5.3 and want to open a MODIS NDVI (MOD13Q1) in hdf format. Firstly, I used the Modis Reprojeciton Tool to reproject the modis tile. And I opened the reprojected file in hdf format ...