A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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24 views

How can one use Google Maps API to mimic QGIS projection/CRS

I used QGIS to find the extents of a list of features. However, the resulting data auto-generates the CRS and changes it from WSG84 to a custom one. Is there a way to use the autogenerated CRS in ...
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1answer
23 views

Difference between source SRS and target SRS in Raster Warp function

Hello I am trying to change a raster layer projections from WGS84 to a custom Lambert layer using 'Raster' --> 'Projections' --> 'Warp' function. I have been asked for source SRS and get SRS. what is ...
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1answer
53 views

CRS of QGIS bounding boxes

I used QGIS to find the extents/bounding boxes of a list of features from census data. I used the following method: Vector - Research tools - Polygon From Layer Extent, which creates a new shapefile ...
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1answer
67 views

Determining unknown Coordinate System using QGIS?

I'm trying to figure out the coordinate system of some data I downloaded from a no-longer-maintained USDA website. The data's still accurate, it's just floating in space. I've tried several ...
2
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2answers
137 views

How to calculate area of shapefile with a merged layer

so i have 'save as''d the new project and layer with my new Custom CRS project string being '+proj=laea +lat_0=70 +lon_0=0 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs'. ...
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2answers
91 views

Choosing the right geo reference system - NorthEast Atlantic

I am currently trying to calculate fish stock density for various stocks in the NE Atlantic. My habitat areas are too large to use UTM and I was wondering how I would find the best geo-coordinate ...
2
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1answer
178 views

How to overlay two shape files with different coordinate system?

It seemed to be easy but make big problems, perhaps it is a beginner mistake. Anyway I have to ask you: I need to lay two shapefiles over each other to make a spatial query. The coordinate systems of ...
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2answers
67 views

Measuring tool shows different measurements for same building in two different map documents?

So I have two map documents with two different Coordinate Systems set for the layers but using copies of the same shapefile. Map 1: Coordinate System: ...
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0answers
32 views

georeference a grid by using a script

I've got an image and a set of coordinates, which represent a grid, that looks similar to this: What I'm looking for is a script, that would transform my image, by using such a grid. Edit: My ...
2
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1answer
34 views

Adding point data from text file when coordinates are in OSGB36

I have a text file in which coordinates are in the OSGB36 National Grid reference system used in Great Britain, so the coordinates are not in longitude and latitude (e.g. coordinates look like this: ...
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1answer
80 views

Can two files have the same coordinate system and still don't align /overlap? [duplicate]

I have two shape files, with the same coordinate system (File 1 and File 2). I have defined the Projection/Coordinate System of File 2 in ArcGIS using ArcToolbox using the Data Management ...
2
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1answer
67 views

Why are my DMS points plotted way off from their true locations?

I'm having a bit of a nightmare plotting some GPS coordinates in QGIS. My coordinates came from a PDF so it took a little wrangling to extract the from the PDF and convert them to a CSV file. I've ...
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0answers
33 views

ERROR 6: EPSG PCS/GCS code error when running QgsGeometryAnalyzer().buffer

I am trying to buffer points from a FileGDB in a PyQGIS script. I setup my environment with the following batch file and run the python script below. The problem is that I get ERROR 6: EPSG ...
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1answer
33 views

Changing Spatial Reference System (SRS) of existing GeoTiff file?

How do I change the Spatial Reference System (SRS) of an existing GeoTiff file? Or more fully, what can I use to convert the meta data for the file to a different SRS?
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1answer
36 views

Data refusing to line up with basemap after re-setting source for data

I've only been using GIS for a couple of months so this is probably just a really n00b problem but I cannot for the life of me fix it. The other day I managed, with a lot of finagling, to create a ...
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0answers
19 views

Guessing a map projection by its values [duplicate]

This is more a theoretical question and not an actual problem that I have. Is it possible to identify or classify projections by their numerical coordinates? Or alternatively rule out in some sort of ...
2
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0answers
60 views

CRS problem: not recognizing the CRS of shapefiles to be the same for all

I'm attempting to aggregate (average) the attributes a point layer to polygon attributes (i.e. block groups and counties) via a spatial join. Both the points and polygons are in the same projection - ...
2
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1answer
55 views

How set correct options for displaying a grid in QGIS composer?

I am using q. 2.5 4291337 in Windows 7 64 bits. I am working with raster and vector layers in EPSG 26714 (UTM NAD27 14N). In this version of QGIS, you are able to put a grid in a different CRS of the ...
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1answer
58 views

OpenStreetView or points from CSV but not both showing?

I'm using QGIS on Mac (most recent version) and am trying to map coordinates from a csv file. When I import the file normally without having any base map, the coordinates how up distributed like I ...
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1answer
648 views

Change OpenLayers 3 view center

I'm using OpenLayers 3 to interact with some maps. I first declare my map: map = new ol.Map({ target: 'map', layers: [ new ol.layer.Tile({ ...
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1answer
51 views

correct projection of GADM data

I'm trying to use a map of Austrias districts from the GADM project. The Shapefile can be found here: AUT_adm.zip (All other formats provided by the project appear exectly equal.) The coordinate ...
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0answers
56 views

Calculating surface and lines in 3D projection in R

For my internship research I am trying to compare the surfacearea and length of geometric shapes and lines in one coordinate system to another. I have a SpatialPolygonDataFrame in the European equal ...
3
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0answers
29 views

How do I map points on a 2D map to a 3D illustration of the same area? [duplicate]

I'm looking for advice on how to build an algorithm that maps any point on a map to a point on another map, interpolating where needed. Let me better clarify with an example of what I concretely ...
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0answers
54 views

Rounding off coordinates in an SpatialPolygonDataFrame in R

EDIT AFTER COMMENTS After a comment of Whuber (Thank you!) I realized it will probably be most easy to incorporate a round(...) statement within my code to be able to work with less decimals. ...
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1answer
57 views

How to convert Geographic wgs-84 to lambert (LCC_wgs 84 projection for a vector file?

I have one shape file with Geographic wgs-84 projection but i need to calculate geometry for that I tried to convert it into UTM projection system. As my data is of whole country so I can't give one ...
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0answers
154 views

How do ESRI and QGIS calculate scale values of geographic projections? [closed]

Does anyone know how (from which location) scale values are calculated in ESRI products and QGIS for geographic projections? The only thing I've noticed is that QGIS is changing scales when you pan ...
2
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2answers
88 views

Geodetic lat/lon to ECEF cartesian: Direction to apply geoid undulation from ellipsoid surface?

I'm working on modeling the earths surface in 3D, using a combination of WGS84/EGM96 and NASA SRTM orthometric height data. To calculate a final cartesian XYZ coordinate for a point on the earth ...
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2answers
83 views

What kind of coordinate system has values like 48569.800mE, 706602.032mN?

I am seeing the following set of coordinates, and I was wondering what kind of system is this? 48569.800mE, 706602.032mN
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1answer
32 views

Issue with gdal getprojection and setprojection returning different information

I am using Landsat imagery from the USGS. Those who use them may know that the projection attribute is wrong (everything is in the Northern hemisphere). I have a script to process tar.gz files and ...
1
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1answer
20 views

postgis - managing single dataset, multiple coordinate systems

I am setting up a forest inventory database that aims to store information about forest plot data from various countries. The current project is in Mozambique, others are in Laos, etc. Each project ...
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1answer
55 views

Specifying output coordinate system in ArcPy

I'm updating somebody else's old Python scripts, and trying to make sure I understand their logic and desired outputs while streamlining the code. In this particular script, it specifies an output ...
2
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2answers
642 views

Convert Feet to Decimal Degrees

I need to convert a bunch of coordinates that were stored in Feet to Decimal Degrees. I found a Function in VB.Net, though it's results are not coming back correctly. When I input 3106972, 1417936 ...
4
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2answers
69 views

Projected coordinate system for South America

Does anybody have any suggestions for a projected coordinate system for the Northern part of South America? I have a data set that reaches from Venezuela to Southern Peru and I'd like to do some ...
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1answer
81 views

Identifying projection for shapefile with unknown coordinate system, no z values and no measures? [duplicate]

I am attempting to create a GIS Project with multiple Brazilian cities. I have been collecting, and am interested in, shapefiles that delineate the neighborhood boundaries of said cities. One city's ...
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1answer
44 views

Map Scale Bar Grossly Incorrect [duplicate]

I am working with open data from the City of Toronto. I am using a base layer of property boundaries which can be found here: ...
1
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1answer
87 views

Tiled raster image to be placed in an OSM/ Leaflet.js map

I have a mapoverlay in a custom projection which I need to add as a layer to an Openstreet map within a website. Since I was not able to change the projection earlier, I decided to manipulate the ...
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0answers
48 views

My map is little bit off

I am pretty new in GIS things and i have been learning how to use QGIS. Most of the maps are fine, but yesterday I went to GIS center at my University and I got the maps of my country that I will be ...
1
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1answer
28 views

Performing transformation from GHANA GRID to WGS 84 using QGIS?

I have a shapefile which was referenced using Ghana's grid system. I imported it to QGIS and specified WGS 84 but the coordinate bar still displays the Ghana grid values in the coordinate bar. Is ...
2
votes
1answer
63 views

How to assign CRS to RasterLayer in R

I have a layer with coord. ref. : NA. How can I assign coord. ref. : +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 to coord. ref. : NA? class : RasterLayer dimensions : ...
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0answers
73 views

How to import a map consisting of pictures

I want to built some sort of Fantasy Map with Quantum GIS. The whole map is built out of 128x128 single pictures, 16384 in total. It should be a flat map. How do I import these pictures and align ...
2
votes
1answer
187 views

Changing map projection and adding graphic features in projected coordinate system using ArcGIS API for JavaScript?

I'm having some problems with the ArcGIS API for JavaScript. I have a web service that traces an electric network and sends back JSON with point and polyline (path) geometry. I've created a function ...
2
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0answers
181 views

ArcGIS WGS84 Web Mercator Vs. WGS84 UTM zone 15N: Very different distance dimensions

I am working in ArgGIS 10.1 with a field (raster layer in tif format) in which I have placed two points (.shp layer). I have two versions of both layers, resulting four layers: one tif+shp set in CRS ...
5
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1answer
82 views

What kind of coordinates are this ones?

I have to map a point using this coordinates: 38 R MF 18852 15799 I can't understand the coordinate system. For sure '38' is the UTM zone number and 'R' is the designation (indicating southern ...
2
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0answers
63 views

How to get a native srs and declared srs of layer using gsconfig?

How we can get native SRS and declared SRS of existed layer in GeoServer? I'm getting up to layer name available in a particular store and work space. The code as follows from geoserver.catalog ...
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1answer
63 views

Adding SRID 3857 to spatial_ref_sys

My application is throwing the following error: DatabaseError: GetProj4StringSPI: Cannot find SRID (3857) in spatial_ref_sys I'm guessing (as stated above) that I need to add the SRID 3857 to the ...
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2answers
241 views

Converting from different projections to WGS84 Web Mercator Auxillary Sphere

I have multiple datasets in my ArcGIS, each having different map projections. All of them are vectors. Some are using Sphere Mercator, others using WGS84. I cannot perform the reprojection function in ...
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0answers
49 views

Arcmap: transform an image from Web Mercator Projection to Simple Cylindrical (Plate Carree) projection

I have an image that is projected using the Web Mercator projection. Does anybody know how to transform (in Arcmap) this image from the Web Mercator projection to the Simple Cylindrical (Plate Carree) ...
3
votes
1answer
50 views

Conversion from Namibian Coordinates to Google Maps (WGS84)

I have coordinates in Namibia, but don't know how to convert them to use them in Google Maps. The system is Lo22/19°. Then Y: +55 435,89 X: -498 157,28 Can anyone help with a conversion?
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2answers
164 views

How do I convert Geo-Coordinates to Pixel-Coordinates on a Map?

I have an image file that is a Robinson Projection Map of the world. I have a list of geo-coordinates. I would like to find the pixel-coordinates on the map that correspond to my the geo-coordinates I ...
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0answers
69 views

Whats an appropriate map projection for georeferencing aerial photos?

I have some aerial photos that were shot from directly overhead a 5x5 mile property. They were then mosaiced to create a continuous overhead tiff of the entire property. I am now going to ...