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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-2
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13 views

not matching shapefiles

I have two shapefiles (see below) and they are not matching, I know that there is a problem with coordinate systems, but I tried so many things. 1. coordinates from google maps Geographic Coordinate ...
0
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0answers
23 views

Shape File CRS Conundrum

In QGIS I have 2 Shape vector layer files which should overlay approximately one on the other. They have both been downloaded from the same government website (data.vic.gov.au) with the same ...
0
votes
0answers
12 views

Krovak projection EPSG 5514: Correct data transfer between R and ArcGIS?

I have a problem which many ArcGIS, QGIS and R users from Czech Republic and Slovakia may encounter. In ArcGIS, I am working EPSG: 5514, Projected Coordinate System, defined as: ...
0
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0answers
18 views

Extracting projection details for TAB files from multiple folders using arcpy's describe spatial reference?

I am trying to extract projection details of vector files (it might be a tab or shp file) in multiple subfolders using arcpy's describe.SpatialReference. If i run this code, i am getting this error. ...
1
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0answers
23 views

Which PCS to use with WGS 1984 datum? [on hold]

I am working on building a Modelbuilder tool to convert a .csv file with lat/long values into a polyline with shape_length. The dataset is in the WGS 1984 datum. It is my understanding that this must ...
3
votes
1answer
80 views

Change the actual coordinates in a shapefile (QGIS)

I'm trying to map data for a county in Texas. The data were provided to me in a shapefile, and I've been working with it in QGIS 2.14. My problem is this: The coordinates in the shapefile I was given ...
0
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0answers
28 views

How is Reprojection done in QGIS [duplicate]

am using QGIS 2.14.1: How i Reproject a point dataset i have into a different format? eg. wgs84 to local system Am New to QGIS, Switching from ArcGIS to QGIS
-1
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0answers
16 views

NTv2 inverse transformation calculation process

NTv2 grid files are used to calculation latitude and longitude offsets for a datum transformation. In the forward calculation, bilinear interpolation is performed by using the four closest points. ...
3
votes
1answer
21 views

Default transformation for a EPSG CRS

Is there any way to know which transformation, from available, is the default transformation for a CRS in the EPSG database? For example, EPSG:4230 has more than 30 transformation available and ...
0
votes
1answer
16 views

How is distance measured in TIGER/Line data for roads?

So I'm working with some TIGER data for network analysis, and it comes with no speed or time attributes, so I was able to assign average speeds to the various road types, and I was going to use field ...
0
votes
2answers
23 views

What CRS to use when creating buffer all over the world in QGIS

I trying to create buffers (50km) around many points all over the world (airport locations) in QGIS. I will then overlay these buffers with a world-wide raster dataset so I can extract information ...
0
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0answers
24 views

How do you line up a pre-existing public domain map with csv coordinate points on QGIS?

I have been struggling with this simple problem all day. I found a Florida map with the counties on Google for GIS. I uploaded the map to QGIS with no problem. However, whenever I try to upload points ...
0
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0answers
22 views

Reprojection script failing after running once

This is related to Getting Error 999999 from arcpy.SpatialReference.name? @Aaron gave me a workable solution. I refactored the script afterwards and it ran once successfully. When I reran it in the ...
3
votes
3answers
49 views

How to get appropriate CRS for a position specified in lat/lon coordinates?

I have a set of city networks whose coordinates are specified in lat/lons. I wish to run an algorithm on each network that treats them as a planar graph. I'm using python and can use pyproj to project ...
1
vote
1answer
72 views

Getting Error 999999 from arcpy.SpatialReference.name?

I'm trying to build a set that consists of spatial reference names using .name method from the arcpy.SpatialRefernce() class. When I do this for a single prj file there is no issue, but when I try to ...
0
votes
0answers
19 views

Making grid from CSV in R?

I tried since several weeks to make a grid with R from AFE data and assign occurrences of my species I have in separate folder with the cell names. Grid data under csv utm_new lon lat xpos ...
1
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0answers
23 views

6 degree of freedom helmert transformation

I'm looking to do datum conversions for points with six degrees of freedom, that is, they are described by a heading, pitch, and roll in addition to their position information. I know how to convert ...
1
vote
0answers
11 views

StreamingRenderer

I have a problem in my code (Java Geotools). When I draw in my carte map a LineString sometimes when I run my program an errors apears and I don't understand what does it means. Error: avr. 14, ...
2
votes
3answers
57 views

Identifying coordinate system?

I'm wanting to create a data layer using some open crime data from Salt Lake City, but I can't figure out the coordinate system they are using. See the link below to view the data. (You'll have to ...
0
votes
0answers
14 views

gdaltransform returns ERROR 1: failed to load datum shift file

I'm trying to do a NAVD88 to WGS84 (G1674) conversion using gdal. I've installed gdal (on centos7) using sudo yum install gdal proj-epsg proj-nad and am trying to perform the conversion via: ...
3
votes
1answer
24 views

VDatum helmert transform parameters

I'm trying to use NOAA's VDatum to verify the NAVD88 -> WGS84 datum conversion in a c++ datum conversion library that I've written. The answers didn't agree, so I attempted to check a simple ITRF2008 ...
2
votes
1answer
36 views

csv - CRS undefined, QGIS

I wonder why some csv files when imported (with long and lat) can not set a proper CRS system and other do (CRS undefined). For example: 1) if I export my data in csv with Microsoft Excel it does not ...
2
votes
1answer
49 views

How to correct ArcMap re-projection

In ArcMap, I add a layer from ArcGIS web server projected in "Bessel 1841 Transverse Mercator". Then I add new layer as a base map from ArcGIS online web server. This is the result: Shift is ...
0
votes
1answer
60 views

How can i convert the coordinates (latitude,longitude) to X,Y using postgis

I want know how i can convert the latitude and the longitude coordinates of a rectangle in the Cartesian coordinates, so I can store them in a geometry field using postgis.
0
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1answer
69 views

Finding Wgs84 coordinate from ascii grid and calculating scale over a slippy tile map?

I am currently trying to calculate the wgs84 coordinate from an ESRI ascii grid file, which the xllCorner and yllCorner coordinates are I believe in Cartesian coordinates, here is a sample of the ...
1
vote
0answers
25 views

Can typical Meets and Bounds (angles and distances) drawings be accurate in QGIS?

I’ve been working with parcel boundary shape files (.shp), standard satellite imagery, and Meets and Bounds (angles and distances) site maps / legal descriptions for a few weeks. Wondering if those ...
1
vote
1answer
27 views

Deciphering coord. ref. in R – very basic question

I'm trying to make sense of the coord. ref. parameters for rasters in R. For example, for a given raster, crs() gives the following: +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 ...
3
votes
1answer
34 views

Do outputs (shp, dwg) inherit vertical datum from input (las) files?

I'm working in ArcMap. I pulled LiDAR data off earth explorer and created a DEM with the LiDAR data. I then created contours as a SHP file and exported to DWG (CAD). I was asked if the CAD file's ...
1
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0answers
28 views

how to calculate area if it is falling in two utm zones [duplicate]

I am using ArcGIS 10.1. How do I calculate an accurate area measure for a polygon, where portions of it are falling in two zones, i.e. UTM ZONE 44 & 45 (India)?
0
votes
1answer
22 views

Converted a USA Contiguous Lambert Conformal Conic vector shape to WGS 84 EPSG 4326 and dimensions changed ~20%

Needed geometric tools to draw lots of parallel lines representing flight paths for taking overlapping aerial pictures - Lambert Conformal Conic was ideal (I thought). But saving to my project's ...
1
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0answers
22 views

Change CRS, but the image position also changing

I have 2 overlapped image, one is an aerial photo in CRS EPSG (4326) WGS 84, and one is a satellite image, in CRS EPSG:32648 WGS 84/UTM zone 48N. I need to georeference the aerial photo compare to ...
2
votes
0answers
37 views

How to instantiate a new map with proj4leaflet projections from a Bootstrap dropdown menu

I'm currently working on a Leaflet website that will be able to display GPS-Tracks with different projections. Now I'm trying to implement a dropdown menu based on Bootstrap, where I can set different ...
2
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0answers
42 views

Calculating Area for data in WGS 84 using ArcGIS for Desktop? [duplicate]

I am using ArcGIS 10.1.1 for Desktop on my laptop. When I try to calculate the area in WGS 1984 the area is disabled. If I work in one projection, say WGS 1984, and calculate area in another ...
1
vote
2answers
49 views

Reprojecting raster from one CRS to another?

I have a .tif raster file which is based on some projected coordinate system (for example: NAD 1983 State Plane California). I would like to export this raster as a .xyz file, but also reprojecting it ...
1
vote
0answers
42 views

projected coordinate system and transformation

I'm a beginner with GIS and I'm currently working on ArcGIS 10.3. I have two distinct shapfiles : one within the projected coordinate system "NTF_Paris_Lambert_Sud_France" and the second one within ...
0
votes
1answer
25 views

Shape files are not lining up [duplicate]

I have two shapefiles, with the same projection but they can not overlay. I understand that the extent is different, but i can not figure out how to change it? Here are the tow layers properties : ...
0
votes
1answer
61 views

How to find a datasets spatial reference and apply it to another dataset?

I'm struggling to use the describe function to find the spatial reference of a given shapefile and then apply it to another shapefile which has been copied to a projected folder. I'm relatively new ...
0
votes
1answer
36 views

I want to have two raster data sets overlay

I am using ArcGIS 10.3 I have 2 raster datasets with different coordinate systems, but they are the same county (just different databases). When I add them to the same map layer they are far away ...
2
votes
2answers
82 views

How to create a QGIS map of unprojected data?

I am attempting to display data generated by Ubisense technology. The data contains non-geographic x y coordinates. I would like to load this data into a QGIS project to perform analysis. Is it ...
2
votes
1answer
24 views

Geotools produces different GEOGCS value for ESRI WKT

ArcMap creates following contents in .prj file for WGS 84. ...
1
vote
0answers
30 views

Problem with reference system

I've imported in QGIS two vectors and setted the same reference system. First is a shape file, second is a csv file. The problem is that they are in different places, but they should be one over the ...
1
vote
1answer
59 views

orthogonal projection of a point onto linestring in PostGIS

I am trying to find the orthogonal projection of a Point (in 4326 SRID) onto a LineString (in 4326). The picture shows the objective. I have tried to use ST_Distance function, but in this case the ...
0
votes
1answer
32 views

watershed delineation using ArcSWAT

I want to delineate a watershed using ArcSWAT tool. Upon uploading the DEM from disk a window pops up & says: Dataset must have a projected coordinate system. The current coordinate system is ...
1
vote
0answers
15 views

Proj4 WKT - Cartesian with origin to EPSG900913

I'm converting wgs84 to cartesian with origin using simple function in c# public static double[] LL_TO_XY(double latitude, double longitude, double originLatitude, double originLongitude) { ...
1
vote
1answer
14 views

Error using gdalwarp in EPSG:4326

I tried to change the projection of AMSR-2 in Python using: 'gdalwarp -geoloc -t_srs EPSG:4326 C:\GW1AM2_201301311114_050A_L1SGBTBR_1110110.vrt C:\test100.tif' It said there are something wrong ...
0
votes
1answer
36 views

metes and bounds from historic plans

I have an historic map from 1912 in feet and has metes and bounds displayed. I am going assume one point on the map (a lot boundary intersection) is the same as it is now and then use the metes and ...
0
votes
1answer
29 views

Do different RDMS use different SRID's to identify the coordinate system of a spatial object?

I'm looking for a reference that lists a standard SRID for a given CRS. Do RDMS's utilize a standardized SRID, such as OGC? Or is it unique to the RDMS?
1
vote
1answer
56 views

Guessing unknown projection in Malaysia

I have a database of northings and eastings of boundary markers of land parcels that are in a form that I cannot pin on any format. I would like to perform some conversions on them so that they can be ...
0
votes
0answers
30 views

Basemap (Matlibplot) not plotting GPS WGS84 coordinates accurately

I have a list of lat,lon coordinates from Flickr pictures taken in Sydney (see here) When I plot these points on google maps, the locations are correct. However when I use my Basemap the results are ...
2
votes
1answer
36 views

Equal area world QGIS

when I use ArcGIS I normally use CRS: Cylindrical Equal Area (World) WKID: 54034 In QGIS I cannot find the same projection. When I re-project my file in ArcGIS and open it in QGIS it says I am using ...