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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3
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1answer
68 views

Best Practice for HTML5 Geolocation with ArcGIS for Javascript API

My organization would prefer to use its own basemaps rather than those provided by ArcGIS Online due to the accuracy of information that is represented in them. The area we service is rapidly ...
3
votes
1answer
29 views

How to define custom projection EPSG:5714 in QGIS

I have a series of raster files with the CRS EPSG:5714. I need to define this CRS in QGIS but I'm fairly new to this and have no idea how to define the proj4 CRS for this. I searched at ...
4
votes
2answers
89 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 ...
0
votes
2answers
106 views

Coordinate System Google Maps API

I am making an application in java using GMaps4JSF where the person will enter the address on the map I'll take this coordinate and consult on my postgis base regions in which region this point is ...
5
votes
2answers
74 views

Is there a standard for the specification of .prj files?

We use shape files for data exchange. I've looked at the .prj files: different programs produce different prj files. Is there a standard how the parameters must be specified in a prj file? AFAIK the ...
2
votes
1answer
40 views

Previous shapefiles do not show in re-opened projects

I have previously drawn a lovely shapefile in a project - all saved...good job. I open the very same project and, although the background raster maps project fine, my shapefile will not show. Zooming ...
1
vote
1answer
87 views

Converting mercator meters without UTM zone?

I've been attempting to extract track information from Humminbird (Side Imaging Sonar) binary files and have hit a stumbling block with the coordinates it provides. The values are apparently in ...
2
votes
1answer
50 views

Proper projected coordinate system for Minnesota for measuring areas

I have seen in ArcGIS many different State Plane systems for Minnesota (location coordinates in WGS84: 44,07 lat/-94,61 long) within the Projected Coordinate system group: NAD 1983 (CORS 96) ...
2
votes
2answers
126 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'. ...
2
votes
1answer
24 views

Accuracy of shape area measurements when GCS shapefile is source of layer in PCS Data Frame?

I would need to deliver a result shapefile in WGS 84 (GCS: Geographic –lat/lon- coordinate system), the shapefile is originally in WGS84; but in the process of creating this result shapefile I need to ...
1
vote
2answers
57 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: ...
1
vote
1answer
30 views

Are shapefile coordinates unaffected when layer exported from Data Frame with different CRS?

I would need to deliver a result shapefile in WGS 84 (GCS: Geographic –lat/lon- coordinate system), the shapefile is originally in WGS84; but in the process of creating this result shapefile I need to ...
1
vote
1answer
349 views

proj.4 definition for Moscow GCS_Bessel_1841 to WGS84 convertion

I'm developing an app which should show a map using Leaflet framework but i have no luck as the coordinate system on the map server differs from the one used by Leaflet. As a map server i use ...
1
vote
0answers
41 views

Vector points from csv file wrong location in QGIS

I am using QGIS 1.8 (I know old version), and uploaded a csv file with coordinates. The underlying basemap is from Google, using the Open layers plugin. This basemap uses WGS84-epsg3857, and my vector ...
19
votes
7answers
955 views

Spatial reference for dummies?

Can anyone recommend a good reference or tutorial that explains the principles of spatial references, projections, and coordinate systems? We are a small team of programmers working with GIS ...
2
votes
1answer
128 views

What are the geometric principles and GIS techniques that I can use to generate a postcode coverage of my city at street scales?

Postal codes of Brazil and another countries are oriented to distribution logistics, and improvement of reliability in writing the postal addresses; but without much concern for the spatial ...
0
votes
0answers
18 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 ...
1
vote
1answer
18 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 ...
0
votes
1answer
63 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
votes
3answers
379 views

Dynamic Text for coordinate system

I would like to change the dynamic script for a coordinate system from "GDA 1994 MGA Zone 54" (Taken from a cut down version of the dynamic text>coordinate system) to "GDA 94 z54" How would I do ...
0
votes
1answer
44 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 ...
2
votes
2answers
680 views

Moving all shapefiles (SHP) in MXD to new File Geodatabase (*. gdb) using ArcGIS Desktop?

What I need to do is to move all the shapefiles in an mxd into a newly created gdb, checking prj, and update mxd reference. I have ArcGIS 10 SP4, license ArcView. I studied a bit of Python and get ...
2
votes
1answer
124 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 ...
2
votes
1answer
25 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: ...
2
votes
1answer
58 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 ...
1
vote
1answer
65 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 ...
1
vote
0answers
27 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 ...
0
votes
1answer
28 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?
0
votes
1answer
27 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 ...
0
votes
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
votes
0answers
42 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 - ...
0
votes
1answer
106 views

Why is shapefile layer not visible on WMS layer in QGIS?

In my QGIS project I have added a WMS layer for which the CRS is WGS84 EPSG:4326. Now I want to show my shapefile layer which has the same CRS. QGIS shows the layer separately but does not show with ...
2
votes
1answer
42 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 ...
1
vote
1answer
296 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({ ...
3
votes
2answers
48 views

Choosing projection to use for Least-Cost Path analysis at continental scale?

I am trying to find least cost paths from the southern USA to the Great Lakes region (for example). My resistance layers are currently in an equal area projection but I'm wondering if I should convert ...
0
votes
1answer
56 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 ...
1
vote
1answer
37 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 ...
1
vote
0answers
52 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. ...
3
votes
0answers
28 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 ...
1
vote
0answers
50 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 ...
1
vote
1answer
44 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 ...
2
votes
2answers
54 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 ...
0
votes
2answers
77 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
0
votes
1answer
632 views

Convert long/lat to indian grid system

how to convert lat/long coordinates to Indian Grid system? I've googled for a couple of days but didnt find the exact algorithm for this. and i got a link Indian Grid System. but i didnt get a picture ...
1
vote
2answers
114 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 ...
1
vote
1answer
55 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 ...
0
votes
1answer
29 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
vote
1answer
19 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 ...
1
vote
1answer
44 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
votes
2answers
426 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 ...