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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5 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 ...
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0answers
11 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: ...
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1answer
2k views

Using a Select By Location in Python and Calculating a field based on what State Plane a point falls in

Here's what I have so far. Do I need to make another feature layer based on the selection? import arcpy arcpy.MakeFeatureLayer_management(r"PATH TO THE POINT", "point_lyr") ...
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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. ...
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4answers
13k views

Change number of decimal digits for features in ArcGIS 10?

I am editing vertices in polygons and points in ArcMap 10, and realised that they only hold 3 decimal digits for the X, Y coordinates, but I would like at least 6 decimal digits. Even if I type in ...
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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
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1answer
79 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 ...
3
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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 ...
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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
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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. ...
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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 ...
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1answer
241 views

GeoTools, convert CRS for Google Maps

I'm trying to use GeoTools to convert coordinates from EPSG:3857 to various CRS, in order to display WMS layers on a Google Map. For example, I want to display a layer in the EPSG:4326 CRS. I have ...
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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 ...
3
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1answer
2k views

Add MicroStation dgn to ArcGIS/ArcCatalog 10.1

I'm an iOS programmer but new to using ArcGIS 10.1. I'm having a problem loading my MicroStation dgn file to ArcCatalog. I've connected the folder containing my MicroStation V8i roadway design dgn to ...
4
votes
1answer
209 views

Choosing Projection for Gulf coast region of USA?

What are the most appropriate datum and projection I could use for the Gulf coast region - spanning Louisiana, Mississippi, Alabama, and Florida? I have to analyze block group data along the coast.
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1answer
772 views

Raster and vector layer in the same CRS don't match

While adding multiple raster and vector layers (and setting them all in CRS WGS84) in QGIS 2.2, they don't seem to overlap. Interestingly enough, only raster files overlap between each other, the same ...
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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 ...
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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 ...
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1answer
151 views

How to Transform Many Projections Into One With SQL Server

I know very little SQL Server, but am quite familiar with Arc and Python. The data I want to transform is point data which is in a single table [ID], [X] [Y], [COORDSYS]. There are 5 possible ...
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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 ...
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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 ...
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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 ...
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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 ...
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2answers
62 views

Coordinate transformation in LAStools?

LAStools program only limited to UTM platform for coordinate transformation (las2project, las2transform). Is there any other ways to transform coordinate for local projection in LAStools? For example ...
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4answers
13k views

How to convert projected coordinates to lat/lon using Python?

I assume this is a basic question but I can't seem to find or recognize the solution. This site returns Point: X: -11705274.6374 Y: 4826473.6922 when you searching with the first key value of 000090 ...
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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 ...
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1answer
410 views

Query all Object within n kilometer Radius with Hibernate Spatial?

I use hibernate spatial attach a geolocation to a car. My card domain class looks like this: import com.vividsolutions.jts.geom.Point class Card { String name Point location } My program is ...
2
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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 ...
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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, ...
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1answer
45 views

How can I assign spatial information in ArcGIS Pro? [duplicate]

I am very new to ArcGIS and I hope I have over-looked something obvious with this! I have a set of polygons that have been loaded into ArcGIS Pro 10.3 without coordinate information. Unfortunately, ...
4
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0answers
101 views

Adding data from PostgreSQL to Query Layer of ArcGIS for Desktop warns that given coordinate references are incompatible?

When adding data from PostgreSQL in a Query Layer I get the warning: The given coordinate references are incompatible I have added many other layers with the same properties no problems, but I ...
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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: ...
2
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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
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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 ...
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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 ...
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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.
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1answer
21 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 ...
3
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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 ...
3
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2answers
439 views

Different definition of EPSG:3857 in GeoTools and QGIS

I want to do some checking if my point lies in any of the polygons defined in shapefile. So, I thought that I will determine CRS from shapefile (created in QGIS), and use it for transformation (where ...
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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 ...
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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 ...
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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)?
2
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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 ...
3
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3answers
3k views

Convert from WGS84 to GDA94/MGA94 on iOS

I have a mobile app (iPhone/iPad) for recording data and taking notes, including photographs, and a government client needs GPS coordinates attached to each photo. They require coordinates in the ...
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 ...
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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 ...
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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
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1answer
2k views

PROJ4 C++ API: Amersfoort RD New to WGS84

I try to convert between dutch RD New (EPSG:28992) and WGS84 (EPSG:4326) via PROJ4 C++ API. On the console this works with: cs2cs +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 ...
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1answer
185 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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0answers
41 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 ...