A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane

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23 views

How to get projection data (.prj) of raster image using GDAL/OGR?

I start with a boundary shape-file (think U.S. states) in lat/long that I convert to some projection, and then rasterize the result as a .tif. What I need now are the raster coordinates of the ...
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13 views

project hdf file with geolocation_lat and lon in batch process

Is there any way that I can do a batch process in projecting hdf file/s wherein I could get and include only the geolocation_lat and lon in the batch script since every hdf file have different geoloc ...
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1answer
18 views

Why prj2epsg cannot resolve PostGIS SRText?

In many places I have seen people referring to http://prj2epsg.org (here, here). I have used this service too, however, the service cannot uniquely identify an EPSG code alway. I understand that it ...
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21 views

Spherical Mercator - World bounds

What are the correct world bounds in the Spherical Mercator projection (EPSG:3857 and EPSG:900913) In some source I got those bounds see this link in the maxExtent parameter: minx: -20037508.3427892 ...
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15 views

Finding centroids for icosahedral gnomonic projection?

I've been trying to create an icosahedral gnomonic projection, like this example by Jason Davies or this one (the Fisher projection). The method that I initially used was using the centroid of each ...
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41 views

Difference between WGS_1984_UTM_33N and GCS_WGS_84

What is the difference between: a map that has a projected coordinate system of WGS_1984_UTM_33N, a geographic coordinate system of GCS_WGS_1984, and a datum of D_WGS_1984 a map that has no ...
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16 views

Thiessen polygons extend outside of extent of projection

I'm working on a geological project on the past position of continents (in ArcMap 10 Service Pack 5, build 4400). The tool I'm creating in Model Builder uses Create Thiessen Polygons and all input ...
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41 views

How does OpenLayers 3 handle coordinates?

Ol3 always uses the flatCoordinates because obviously it needs 2d-coordinates as the screen is only 2-dimensional. But how does OL3 calculate the flat representation? For example if my view’s ...
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22 views

ArcGIS Online no spatial reference

My intention is to georeference an image so as to create a Swipe Map in AGOL. First, I add my control points, rectify, then analyze before attempting to share and finally publish in AGOL. The other ...
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15 views

set Default projection in postgis table

I've set the SRID 4326 for a table having geometry column, but when i insert a geometry without SRID, i get an error because no SRID specified is interpreted as -1 or 0, so how i can set a default ...
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25 views

How to manually add spatial reference information for FEWS rainfall data in ArcMap?

I am trying to match rainfall data from USGS/FEWS to coordinate locations of survey households in Uganda, so I will need to be able to project the rainfall data. So far, I downloaded the dekadal RFE ...
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28 views

Zonal geometry output in ArcGIS

Is there a way to specify the coordinate type in Zonal geometry output in ArcGIS? I am trying to perform zonal geometry on a raster and in the resulting output, the XCENTROID and YCENTROID are in ...
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1answer
38 views

Openlayers 3 WMS custom projection wrong extent

I'm using Openlayers 3 to view a WMS-layer from a Mapserver in EPSG:3006, see the code: Proj4js: Proj4js.defs["EPSG:3006"] = "+proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m ...
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3answers
66 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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12 views

Multiple Satellite Swatch processing for 1 years worth of data

I have a file of several scans per day for one year. I am using the OMINO2 product from the Aura platform. I am tasked with creating an automated process to: 1) Extract the sub-data set within the ...
2
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1answer
52 views

Defining projection using readOGR if the shapefile doesn't have it?

I think that by using readOGR to import a shapefile renders worthless to put proj4string to the script since if any coords are available in the shapefile, it will be transported through the readOGR. ...
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6 views

Lots of NaNs in reprojecting LSASAF to WGS84

I have a LSASAF file that has LOFF 1808 COFF 308 LFAC = 13642337 CFAC = 13642337 and the standard Euro dimensions NC = 1701 NL = 651 But when I try to translate the range col=1..1701, lin=1..651 ...
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44 views

How to set raster projection in R

I am new to R and grib files. library(raster) I have a "grd" file in and I am trying to set the coordinates to polar stereographic projection r <- raster("p190001.grd") # class : ...
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23 views

ogr2ogr re-projection produces empty shapefile

I use the following to re-project a shapefile to EPSG 4326 using ogr2ogr: ogr2ogr -s_srs "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" -t_srs "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" ...
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25 views

Is EPSG:3857 the correct projection for my PDF in Lambert Conformal Conic projection?

Given the following NEATLINE from the results of gdalinfo on my Geospatial PDF: NEATLINE=POLYGON ((-1340591.5297333347 -260482.28440259479,-1340591.0579001249 1878014.4171204455,3081498.0723039531 ...
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1answer
29 views

QGIS reprojecting .ecw file in EPSG:23032

I opened the .ecw file with qgis but I found that the ortophoto is 340 mt northern and 150 mt eastern the topographic map. How can I move the ecw?
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37 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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1answer
42 views

How to convert latitude, longitude to EPSG 3857?

I'm looking to study the math involved to see how a given latitude and longitude in decimal degrees can be converted to epsg 3857. Can anybody point to a good reference or a possible python/c/c++/java ...
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42 views

How to use a different projection than EPSG:3857 with CartoDB or Leaflet?

I have data that is accurately positioned with the NAD 83 MTQ Lambert EPSG:3798 projection. If I reproject this data in EPSG:3857 (web mercator) the markers are no longer positioned accurately on the ...
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1answer
20 views

Change Projection

I am a little bit lost here. working in QGis 2.8, OS X 10.10. I have a polygon shp in the CRS EPSG: 21781, CH1903 / LV03 and a point file in EPSG: 4326, WGS84 How would I work with these ...
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26 views

Adding IF statement for Batch Projections

How do I add an "if" statement that will: 1) List all .tif files and their projections within the input directory 2) Copy all .tif and .shp files that are of the same projection from the input ...
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1answer
45 views

ArcGIS 10.2.1 projection Issue - Everything shifted west 50 m

I just completed hand-digitizing features on some NAIP (NAD83) imagery as a shapefile (NAD83...or that's what I thought I was doing). The coordinate system for the dataframe was NAD83, but now when I ...
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38 views

Finding the coordinate system for LiDAR points [duplicate]

I have several .dxf files that I imported into ArcGIS. I don't recognize the projection, but they are in Central California and are approximately X: 7,000,000 Y: 1,800,000 I am trying to 'define ...
3
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1answer
93 views

Obtaining length of non projected feature (gcs_wgs_84) in meters instead of decimal degrees?

I could not find a post which answered to my problem and I hope I didn't miss it, in case I did I apologize. I'm working with Arcgis 10 and I have a multiple lines feature with gcs_wgs_1984 ...
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29 views

ESRI/Mapinfo MGA56 prj vs QGIS MGA56 prj

I am trying to understand why the degree unit is different between ESRI/Mapinfo and QGIS: ESRI/Mapinfo ...
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67 views

Change SHP Projection to display on Google Map

I'm pretty new to GIS but not to programming, so sorry if this was already asked. I didn't find a solution not sure if I didn't quite understand everything about Projections and so on. I have a GIS ...
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19 views

How can I create a warp mesh to match two close but not identical datasets together?

I have two datasets for Mars. One of them is the Mars Viking color mosaic, the other the Mars Global Surveyor black and white imagery. When I overlay the two datasets, it becomes obvious that the ...
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17 views

Error in projection Qgis [duplicate]

qGIS- when I try to project using +proj=robin +lon_0=-150 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs In order to centre on the Pacific I get this: Any advice? Thank you!
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1answer
37 views

Displaying a map in EPSG:26915 projection in open layers 3

My GIS experience is limited to having worked on several Geospatial Humanities projects. That is to say that I still struggle significantly with the technology (and terminology) in getting to my goal. ...
3
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3answers
157 views

Which projection is best for mapping the contiguous United States?

If I wanted to project latitude & longitude data for the contiguous United States (the United States excluding Alaska and Hawaii), which projection would I use? I prefer more accurate distances ...
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2answers
85 views

How to change different projections of feature classes in geodatabase to one projection in new geodatabase?

I want to create a script that iterates through feature classes with different projections in a geodatabase and exports them into a new geodatabase, all with the same projections. What I want is to ...
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33 views

Raster displaying in ArcGIS

Can anyone please explain this to me? I need the image to be displayed right in any case as I will be using it in different programs. When I open this raster image in an existing ArcGIS map it ...
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42 views

Raster overlay with different projection in Google Maps

I have a map created with Google Maps. I want to overlay over some data I am downloading dynamically, covering the whole world. That data is a matrix as follows: 1024 values for the longitude ...
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0answers
14 views

Misaligned layers unknown projection [duplicate]

I have two datasets for Rio de Janeiro, Brazil that come from the same original dataset and are almost exactly the same. However, one has been projected into an unknown projection. Both were at some ...
2
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2answers
36 views

Overlaying Shapefile with projection and raster (without projection but with defined extent) using QGIS?

I'm trying to overlay a shape file into a raster. The raster has no defined projection but it's a global raster with extent 0, -1800 : 3600, 0. I tried "on the fly CRS" transformation and followed the ...
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36 views

UTM ED 50 transformation to WGS84

I have a set of navigation shot points (pre 1975) with coordinates that are based on a UTM ED50 zone 33 projection and I need to transform these to WGS84. My procedure has been to load the excel fine ...
2
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2answers
36 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 ...
2
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3answers
93 views

Plotting Netcdf data. How to get right projection?

Maybe it's very easy for someone to fix, but I'a a new one in R, so I really need help. I/m trying to plot data containing lat, lon and variable (nmf2). The grid isn't a regular one, so there are some ...
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30 views

Guessing unknown projection of Webapp

I have a series of points around the greater london area (may be also around 100-200kms away from it) like those here in the format Lon, Lat: 43032.1,32681 95816.5,34473.8 15439.3,-13987 The ...
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1answer
34 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, ...
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25 views

How to set projection parameters in ArcGIS?

I would like to open .hdf satellite data(FY-3 from China) in ArcGIS, but there is unknown projection info in it. The extent of hdf is : top: 0 right:1383 bottom:-586 left:0 And the projection ...
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23 views

Polygon Shifting in WGS 84

I'm troubleshooting some discrepancies between intersection results in State Plane and WGS 84. The intersect was ran when both the polygons and points were same PCS ...
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1answer
33 views

How do I interpret this proj4string and why doesn't changing units change its resuls?

I'm new to GIS - I have a background in statistics. I have the following proj4string: '+proj=lcc +lat_1=40.66666666666666 +lat_2=41.03333333333333 +lat_0=40.16666666666666 +lon_0=-74 +x_0=300000 ...
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1answer
40 views

Determine projection of a shapefile

Is there anyway to determine projection of a shape file which doesn't have .prj file? I am trying to re-project this shape file to another projection, I know that it is Lat long data. I could manage ...
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1answer
53 views

How to add a lat/lon grid to a map using azimuthal projection?

I have a north azimuthal projection, equal areas. I want to create a map from it (in QGIS) and display a grid on it for better orientation. Thats how it looks like: Why doe my degrees have so ...