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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11 views

Scale and density values in density map appear wrong when in projected coordinate system?

I'm making a series of maps illustrating different aspects (road density, location of dams, elevation etc...) of a single watershed in California. In most of my maps, I've had the projection set to ...
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0answers
34 views

QGIS Server & custom CRS

I'm using QGIS Server and an OpenLayers-based web client (in EPSG:3857). I have a QGIS project that I want to serve with QGIS Server, containing layers in several CRS, including custom ones. ...
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4answers
321 views

Batch conversion of XY coordinates to latitude and longitude

I'm working on a school project. I have this dataset from Sacramento, California http://data.cityofsacramento.org/search/?q=police I want to convert the XY coordinates to latitude and longitude, in ...
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0answers
20 views

Transform itrf96 to web mercator 900913 proj4s

I am using cached basemap tiles with itrf96. proj4 version is like this: Spatial Reference Page +proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=500000 +y_0=0 +ellps=GRS80 +units=m +no_defs I want to ...
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0answers
38 views

How to use Esri custom geographic transformation in FME Desktop 2015 Workbench?

I am trying to reproject DWG files from one projection system to other using a custom transformation created by me with ArcGIS. When I execute it reprojects the data but does not use the custom ...
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0answers
33 views

Which projection system should I use to have my layers over Google Maps as basemap?

I am using Openlayers 3 with Google Maps in javascript to have my custom layers over a Google Maps basemap. My layers are in Projection EPSG:4326 (WGS 84), but are not falling in place on the ...
1
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1answer
56 views

How can I create custom projected coordinate system in arcpy?

I want to create my own projected coordinate system based on one of geographical coordinate systems and set custom values to properties as longitude, scaleFactor etc. I found SpatialReference class. ...
6
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2answers
182 views

What is the difference between spatialreference.org catalogs: EPSG, ESRI, and User-defined?

I'm trying to understand EPSG codes. I've been to the spatialreference.org site, and in its "about" link, it states: "There are currently three distinct catalogs of spatial reference systems on this ...
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1answer
86 views

Why do pyproj and matplotlib basemap produce different results when they convert my lat-long data into a CRS?

pyproj and matplotlib basemap seem to produce differing x-y values when they convert my lat-long data into the same CRS (such as Albers Equal Area). These x-y values tend to be off by hundreds of ...
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0answers
25 views

Is it safe to query for points contained within polygons using a lat-long projection?

I'm querying for points contained within a polygon. All data - both points and polygons - is stored in latitudes and longitudes. Technically I should probably project this data to a suitable local ...
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0answers
20 views

Should I set the projection if the data has already been projected?

I need to plot some data which was produced on a native grid with a lambert conformal conic projection. I need to create a geotiff (using python and gdal) and was wondering how to go about and do ...
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0answers
24 views

Querying for points within polygon in MySQL?

I have polygon in this format POLYGON(23.816364700000001 87.574939799999996 ,23.814872699999999 87.572279100000003 ,23.812595399999999 87.572279100000003 ,23.809925700000001 87.571678300000002 ...
4
votes
1answer
40 views

Can Irish points be accurately represented by British OS Grid references?

I'm currently working in a database which stores mainland British locations as their Ordinance Survey Northing/Easting values. Can points in Ireland (primarily Northern Ireland) be accurately ...
1
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0answers
41 views

problem with area calculation in QGIS

I encountered a problem in QGIS 2.10.1 when I tried to calculate the areas of polygons in a polygon layer. I followed the instructions here ...
2
votes
1answer
74 views

Map opening in Indian Ocean on QGIS Web Client?

After installing web part of qgis i created a project with layers. All layers are working, but i always need to scroll the map to reach these layers. How can I open the map exactly there i want? I ...
0
votes
1answer
95 views

Projection error, geotransform not valid

I am trying to extract data from gridded weather datasets such as GLDAS from pixels in which weather stations are located. I created an ArcGIS shapefile of weather station points. These ...
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1answer
30 views

What is most accurate Spatial reference system for calculate Area entire world [duplicate]

I want to know what Spatial reference system is most accurate to calculate area? I want to use it for entire world (-180,+180,-90,+90 area in WGS84 system) I have every thing ok I only need to ...
0
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1answer
26 views

Ways to make distances more apparent

I have made this map: The intention of the map is to make it clear that the distances is shorter from Luleå than from Rome. As you can see that is not the case here. Which ways are there to make ...
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2answers
67 views

Coordinates transformation

I have the following data base with information about rainfall for a set of meteorological stations: year station latitude longitude depto municipio date rainfall 1990 11010010 0527 N ...
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1answer
26 views

How to display coordinate-system properties of raster data in FME Data Inspector?

FME Data Inspector shows detailed information of coordinate-system properties of vector data sets (marked in green). But for raster data sets FME displays in the status bar only basic information ...
0
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2answers
96 views

How to convert projected coordinates to geographic coordinates without ArcGIS? [closed]

I'm trying to convert a series of points from Easting Northing to LatLong, I have this working perfectly in Arc but ideally I would like the algorithm to do it through our own system. It is a huge ...
2
votes
1answer
27 views

Representing coordinates on non-earth globes in semantic data

There are standards to represent geospatial data in the context of linked data, such as GeoSPARQL. However, I could not find a way to represent the coordinates that are not on Earth - such as, for ...
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1answer
47 views

CRS changes even though set in project

I am slightly confused as to why when i am working in projects the CRS changes when I add new data, e.g. add Bing maps or try to georeference an image. The CRS is set in the project and when I am ...
0
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1answer
45 views

Trying to find Coordinate System for Dubai?

I have a CSV file to convert .shp. The X,Y values are like X -40219075 Y 200946341 This is somewhere in Dubai area. Can any one tell me what will be the coordinate system they used for this?
2
votes
2answers
99 views

projection conversion from local to UTM

I have some images at a local coordinate system with the following specifications: TIFF header file: -gdalinfo im.tif Driver: GTiff/GeoTIFF Coordinate System is: PROJCS["Eastern Ridge Project Grid ...
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0answers
28 views

Using GDAL to ID a pair of GeoTiff Coordinates

I've got a large library of images with no spatial reference. When I view the GeoTiff properties, I can view a lat/long under a "GPS" heading, but there's no indication of a coordinate ...
0
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1answer
43 views

Offset after projection from WGS84 to ETRS1989

I'm using ArcMap 10.3, my dataframes coordinate system is "ETRS_1989_UTM_Zone_32N_6Stellen". I have several shapefiles in my project which are using the WGS84 system. When I try to proct them to ...
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0answers
59 views

Strategies and methods that Datums and Coordinate Systems use to account for movement of the earth's surface

Are there datums and coordinate systems that address the issue of shifting coordinates through time? If so, what are some of the strategies and methods that the datums and coordinate systems use to ...
2
votes
1answer
37 views

Issue rendering polygons at global scale when using the Robinson coordinate reference system in QGIS 2.10

I am trying to create a map using the Robinson coordinate reference system (EPSG:54030) in QGIS 2.10, on Mac. I used the 'on the fly projection' feature in the Project Properties. My base layer is a ...
4
votes
1answer
210 views

On python, how to generate an array of coordinates between two points

Perhaps I'm looking to a solved question, but while searching I didn't find any solution. I need to build a matrix of lat, lon values, based on two points, and a sampling rate (distance between ...
1
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1answer
19 views

rendering issue when viewing polygons in mollweide projection

Arc10.3, windows I am using and etopo bathymetry raster with various polygon, line, and point layers over it. One of my polygons encompasses the north pole. This polygon automatically created a ...
3
votes
1answer
54 views

How to transform unknown coordinates?

I have two lists of coordinates in lat/long format which are showing the same points but in different coordinate systems. I need to find the corresponding points in two datasets using distance but ...
4
votes
1answer
67 views

What projection should I georeference this historical map to?

I'm using ArcGIS. I have a historical map from 1884. It has bathymetry information which I would like to compare to modern bathymetry models with as much accuracy as possible. I don't know what ...
0
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0answers
20 views

ArcMap - UK - Ordance Survey Map Misalignment

I'm trying to load an Ordnance Survey Great Britain 1:50000 basemap that I downloaded. It should be centred over north-east Scotland, but is showing as somewhere near Nigeria (Africa). I've tried ...
2
votes
0answers
51 views

Extracting Multivalues to Points from NETCDF4 Raster using ArcPy seems imprecise?

I'm getting some strange results in a multivalues to points extraction from a NETCDF4 layer from the MERRA reanalysis product. In particular, it seems like the values being assigned are way off in ...
1
vote
2answers
64 views

Convert UK OS grid coordinates to decimal degree WGS84?

I've got a list of coordinates in the UK Ordnance Survey grid system e.g. "NZ 27 41" or "NZ 284 449". How do I convert them in QGIS 2.10 to decimal degrees so I can map them in QGIS in WGS84? BTW, is ...
2
votes
1answer
103 views

Adding OpenLayers basemap to a QGIS project changes the CRS to WGS 84 / Pseudo Mercator

I have a QGIS (2.10.1) project that contains several shapefiles, all of which are EPSG:3338 (NAD83 / Alaska Albers). The project property CRS is also EPSG:3338. All of the shapefiles display ...
-1
votes
1answer
62 views

Points don't show up on an overlaying shapefile?

library(ggmap) library(rgdal) cities<-c("city A","city B") country<-readOGR(dsn=".",layer="country") gc<-geocode(cities,source="google") gc$names<-c("city A","city B") ...
2
votes
1answer
116 views

String of coordinates into Openlayers-3 Linestring on Vector Layer

I getting a string of coordinates like so: [[38.313072, -89.863845] ,[38.312675, -89.863586] ,[38.310405, -89.862091] ,[38.310405, -89.862091] ,[38.309913, -89.861976] ,[38.309768, -89.861976] ...
1
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0answers
58 views

Disparity between QGIS and ArcGIS for Desktop georeference results?

I am georeferencing a static map in JPEG format. I would prefer to use QGIS for a variety of reasons. I've never georeferenced with QGIS before, so I may not have the process quite right. I ...
1
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0answers
30 views

Easy Custom Labelling and CRS Issues

I'm having several issues with a vector layer in a project I have been working on for the last week. None of the overall settings have been changed but it appears that there is an issue with the CRS ...
0
votes
1answer
52 views

Point feature class from xy coordinates cannot be related to project in ArcGIS

Once created the point feature class from XY coordinates I imported from an excel table (e.g. X: -4,415622; Y: 36,733385 using ArcCatalog), I am able to zoom to the layer, but I am not able to relate ...
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0answers
19 views

Updated GPS coordinate shows rotated point

So I have a GPS coordinate: 8.6258,47.3325 Which I use as my origin. Then I have the path of an object that has been moving around based on the ENU position, say: -10, 12 //east, north in meters ...
2
votes
1answer
52 views

CSV to Layer from a Delimited Text File in QGIS

enter image description hereI am importing a CSV file into QGIS using the official instructions on their page: http://www.qgistutorials.com/en/docs/importing_spreadsheets_csv.html. For some reason, ...
0
votes
1answer
35 views

What unit is the Shape_Length field in for the GCS_North_American_1983_CSRS projection?

How can I convert these to values to meters? I'm trying to use the Densify tool but can't because I'm assuming the distance field is tied to Shape_Length.
4
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2answers
111 views

Are Australian Height Datum and GDA94 applicable to Christmas, Lord Howe, and Norfolk islands?

I've been asked to recommend a mapping coordinate reference frame for use for Australian mapping, which I've said AHD for the vertical component and GDA94 for the the horizontal component. However, ...
3
votes
1answer
33 views

How to map a dataset with multiple datums

I have a dataset (in excel) of species with the coordinates in which they were sighted, collected by many different people over decades. Aside from coordinates, the dataset also specifies a datum ...
2
votes
0answers
32 views

Using points in polygons tool with QGIS and CRS?

I am working with 2 layers. 1 shows a polygon of a district and is in CRS EPSG 4326 and another layer (address layer) is in CRS EPSG 3082. I right click the address layer and "save as" and specify ...
5
votes
2answers
82 views

Which CRS with units in meters for central Germany?

I found several questions in regard of reprojecting data into a CRS with unit of meters and what CRS to use. Usually the counter question is, "for what region, on what scale" and there the discussions ...
1
vote
1answer
39 views

How to use openlayers 3 with epsg 32749

I want to set coordinates of my map in epsg 32749. var view = new ol.View({ center:ol.proj.transform([43037,9138591],'EPSG:32749','EPSG:900913'), zoom:10.8 }); var map = new ol.Map({ ...