(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.

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3
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1answer
90 views

When validating geometries, what are “Nested shells”?

I am validating shapefiles polygon geometry using shapely, and have also attempted it using FME. Some polygons return the error "Nested Shells". I cannot find a definition of what the problem is, ...
0
votes
0answers
119 views

How to add the geometry to google maps from geojson(retrieved as json) for a specified condition using javascript

I have a array called place_names which holds some place names. I have a GeoJSON layer loaded in CartoDB, which has three columns id, name and the_geom (which is a geometry object) that can be queried ...
1
vote
1answer
51 views

Spatial ETL for MutliLineString [closed]

I'm pretty new to Spatial ETL. In accordance with this question I have experience the geokettle v3 but unfortunately i'm having a several problems working with it. There is some issues that aren't ...
0
votes
0answers
22 views

Transforming OpenLayers.Geometry

I have OpenLayers.Geometry objects (point, multipoints, polygons etc) with longitude and latitude coordinates for WGS-84 ellipsoid Earth model (for OpenStreetMap). These objects are properly displayed ...
4
votes
2answers
328 views

fixing polygons with “ring not closed” errors

I have a shapefile with a single Polygon feature. This feature has a "ring not closed" geometry error (seen here in QGIS): I tried using buffering and the GRASS v.clean command as suggested in other ...
-1
votes
1answer
92 views

fiona writing geometry into shapefile problem [closed]

Context: I use lxml library that generates some dictionary (infact it is xml attribute dictionary) from xml and i am trying to write these into a shapefile-i.e. get one element-attribute from xml ...
1
vote
1answer
69 views

QGIS crash while delete duplicate geometry

I have a polygon shape with nearly 60 000 features (at around 3 000 square kilometres) in QGIS 2.12. I try to delete duplicate geometries from this layer and the algorithm runs until 99%. Then QGIS ...
2
votes
2answers
35 views

Mountain chain and geometry

Concerning Mountains chain (in Wikipedia https://en.wikipedia.org/wiki/List_of_mountain_ranges) where can I find any maps with Montains chain and also geometry for those?
2
votes
2answers
192 views

How to find multiple centers of gravity?

Say I have a number of customers in a geographical area, marked "c": Each customer has a Lat/Long. I would like to find x number of points, in the same space, that best serve the customers, ie. ...
1
vote
0answers
33 views

Split Polygon Layer by other Polygon layer in QGIS

I know there is a lot of previous posts to this subject, but I simply cannot find the solution I am after in the other posts. I have to following problem: I have two very extensive polygone layers, ...
1
vote
1answer
95 views

Finding Points where two polylines cross in ArcGIS Runtime .NET SDK?

I am using ArcGIS SDK for .NET and have a graphic overlay defined on my mapview. I added two circles to the map (made with polylines) which overlap. I now need to determine the points at which the ...
1
vote
1answer
102 views

arcpy and ArcGIS Pro: update Z values of a pointMZ geometry

I am trying to "reverse" the values of Z in a pointMZ geometry with arcpy.da.UpdateCursor. Anyway, I am not able to find a way to achieve this, although my script seems to work (no errors, printing ...
0
votes
2answers
116 views

How to get the specified point coordinates of a Polyline

lines_cursor = arcpy.da.UpdateCursor(lines,["From_id","To_id","SHAPE@"]) for lines_row in lines_cursor: from_id = lines_row[0] to_id = lines_row[1] if from_id in points_dict.keys(): ...
1
vote
1answer
60 views

Calculate location on line with known azimuth to point

I have the following situation (consider distances up to 300m - without great circle etc. affects): How can I calculate the unknown location when I have all other locations in the triangle and ...
0
votes
1answer
67 views

Calculating Geometry (area) in a spatial join attribute table

In ArcMap, will Calculate Geometry (area) be accurate for records that have other polygons attached via Spatial Join? It doesn't seem to be adding the extra polygons that are spatially joined. ArcGIS ...
1
vote
1answer
145 views

Area Calculation incorrect

In ArcGIS 10.2 I created two buffers using the default settings one with a distance of 1 kilometer. When I calculated the area it has a square kilometer area of 3.14. All seems fine there to me. ...
1
vote
0answers
7 views

Walking a number of kilometers in one direction in digital map [duplicate]

Is there a recommended way to calculate the new position of a point in a map when "moving" the point for example 10 kilometers to south ? Example: Point = { lat : 'LATITUDE VALUE', lng : '...
2
votes
2answers
133 views

How to create a PostGIS table with arc support compatible with QGIS?

In postgis database I have two tables - let's say 'polygons' (gid, the_geom,MultiPolygon,srid=2180) and 'lines' (gid, the_geom,MultLineString,srid=2180). I'd like to use "Add circular string tool" ...
0
votes
1answer
129 views

How to increase performance for nearest neighbour query using a multipoint? (Boost Geometry)

The following function gets the nearest point in an rtree to a multipoint geometry. I'd like the performance of the function to be better. Is there any way to make it faster? TimingLink* ...
0
votes
0answers
25 views

Convert Lat and Long Data to Geometry datatype in SQL server [duplicate]

I need to convert Sql Server latitude /Longitude to geometry datatype I have just imported a csv to my table in my database. Table consist ID Begin_trip Lat Begin_trip Lng Drop_Lat Drop_Lng ...
5
votes
1answer
165 views

Repair geometry using QGIS

I have shapefile with few polygons. Some of them are self-intersecting. In ArcMap I can use "Repair geometry" tool, and it works well. But problem is, that for that task some users need to use open ...
1
vote
2answers
44 views

update data via cron in cartodb

I want to automaticaly insert/update points via cron in cartodb. I am using SQL API. How can I generate the_geom row via sql api in WKB format without web-interface? Like this: ...
1
vote
0answers
126 views

SQL Server Geometry draw rectangle around a line

I am VERY new to spatial data queries, so please bear with me. I have a LineString (geometry) in SQL Server and need to "draw" a rectangle around it, based on padding for the Width and the Height, ...
1
vote
1answer
319 views

Openlayers drawing interaction geometryFunction

Can anyone help me to convert this function so that it is not dependant on the ol3-debug file as I don't know quite what is replaced upon build. The function works but only in debug mode. It is in ...
0
votes
0answers
31 views

Fit picturefillsymbol size into polygon (SceneView) - Arcgis Runtime .Net 10.2.6

I'm working with ArcGIS .Net SDK version 10.2.6 using 3D SceneView. I want to create a GraphicsLayer, define a square polygon and fill it with a picturefillsymbol (picture is a circle) keeping it ...
1
vote
0answers
52 views

regroup the close points [closed]

I have a list of 10 000 points, and I wish consolidate 15 points each in a block in the vicinity. I use arcgis, or mapinfo qgis, I just need the method.
2
votes
1answer
104 views

Get the number of bends of a polyline

I am trying to get the number of curves/bends of a polyline. I know that I can accomplish this by getting the vertices of the polyline, and check the from and to and compare their angles, if they ...
0
votes
1answer
64 views

Creating info window that allows user to scroll through different data sets with same geometry using CartoDB?

I am using CartoDB and am mapping water quality data in a particular region in Mexico. My organization has data of multiple locations over many years. Since we are showing the same data of the ...
1
vote
0answers
58 views

Why is the geometry changing slightly when I import shapes into a postgresql database with postgis?

I recently posted this question when first trying to import data from a file geodatabase into a postgis database: how can I maintain curves when converting from geodatabase to postgresql using og2gui ...
1
vote
1answer
256 views

Create polygons from points representing the corner vertices (ArcGIS)?

I am on ArcGIS 10.3.1. I have a point feature class that represents the corner vertices of the polygons. They are located in a regular grid. The labels represent the OBJECTID. The points can be ...
9
votes
1answer
624 views

How exactly is the centroid of polygons calculated?

I would like to know how exactly QGIS Geometry tools -> polygon centroid is calculating the point coordinates. For example does it divide the boarder of the polygon into small points, take two pairs ...
1
vote
0answers
39 views

Is there a way to select polygons by geometry (right angle)? [closed]

Is there a way to select polygons by geometry? I need to find a way to detect all the polygons that have a right angle, but I can't find a tool that can do that. I'm using QGIS 2.10.1 and ArcGIS ...
3
votes
1answer
565 views

Update a table with values from coordinates on GEOMETRY in Oracle

I have 2 columns in a table that represent the X and Y coordinates. The values in those columns don't match the actual coordinates and I want to update them with the coordinates values that are ...
0
votes
1answer
47 views

How to get Lat/Lng from a Geometric property?

Alright, I am very new to GIS, my question might not even make sense, but help me get through this. I have this JSON data of some fields which have this geometry property: "geometry": {"type":"...
1
vote
0answers
16 views

Quantum gis 2.2 - pasting templates

Is there a way to paste geometries in a workspace at the location i want? e.g. i want to paste a circle from another workspace in the workspace i'm working with. I need only the geometry, not the ...
1
vote
2answers
171 views

Can QGIS import Multipatch geometry type?

can QGIS import multipatch 3d geometry type? What is the data structure of multipatch how computer record and draws it ? Is it solid or not??
0
votes
1answer
242 views

PyQGIS: how to transform single QgsGeometry object from one CRS to the other?

I have a polyline layer with roads in WGS84 that covers several UTM zones. For every road I need to place a set of points at different distances (in metres). To do so I want to reproject each road to ...
1
vote
1answer
96 views

What does double digitized polygon mean?

I know what is a polygon but when a polygon is said to be double digitized? I failed to find a suitable meaning of double digitized after googling. I understand double digitized means digitized twice,...
0
votes
2answers
373 views

What is nontopological geometry?

I need a simple understanding of nontopological geometry. I am completely new in this area so please correct me if I am wrong. As far as I understand in topological geometry the object(say a line) ...
1
vote
1answer
308 views

Querying Oracle geometry data type

How to query or find the geometry data type a given Oracle Database is using in SQL Developer (i.e. SDO_Geometry, ST_Geometry, etc)? I thought I could just describe a feature class within the ...
2
votes
0answers
66 views

Geometry issues when digitising in QGIS

I'm digitising a large number of maps from hand drawn mud maps and digital images, and although I have used the snapping tools ("snap to vertex and segment", Tolerance 10 pixels, avoid intersections) ...
1
vote
0answers
136 views

ArcGIS/ ArcPy - XY coordinates of feature class does not match calculated geometry XY

Tested on: different workstations, different Windows versions; ArcGIS Desktop 10.3, different license levels Background: I use the Google Maps DistanceMatrix to calculate drive times between two ...
2
votes
1answer
98 views

Create geometry from a result of intersection [closed]

Split a polygon in half with an extended line public Ipolygon CreatePolyFromIntersection(Ipolgon polygonA, Ipolygon bounradyThatcontainsPolylgonA, IFeature lmark){ ...
2
votes
2answers
99 views

Query Features in Certain Direction

I have a polyline that I would like to query features that are on it's left, right, top, bottom. I am not looking for the features surrounding it but for features that are on a certain location from ...
0
votes
1answer
123 views

Qgis 2.10 unable to add a new feature in spatialite via sql function “GeomFromText”

Using Python code in my plugin the function in sql language "GeomFromText(POINT(X Y))" gives the following error: "OperationalError: no such function: GeomFromText" Plugin functions in previous ...
8
votes
3answers
2k views

How to convert from SQL Server geometry BLOB to something else?

I have a CSV data file from a 3rd party that is an exported SQL Server table. They simply did a select * from foo and output the result to a text file and sent it over. In their table is column of ...
0
votes
0answers
28 views

Determining North-South Line Via Watch Method?

I read about Determining North-South Line Via Watch Method recently (page 9). What is the underlying geometric/celestial reason this works? What is the error to true north given this method? Is ...
1
vote
1answer
86 views

Shared edge between two geojson polygons

I am interested in getting the coordinates of a shared edge (if exists) between two geojson polygons. I am (currently) using turfjs and geojson-equality libraries I tried this but I consider it quite ...
2
votes
1answer
258 views

Remove inner rings from QgsGeometry polygon in QGIS Python

I am a QGIS python user. I want to iterate over the rings of a polygon to remove holes in the polygon, so: I need to iterate over the rings in a QgsGeometry polygon I need to detect the main ring ...
5
votes
2answers
149 views

Polygon points to Polyline

I am trying to create a polyline from the points that I query from a polygon. I have a polygon, and I am getting its edges, casting them to segments, and then use QueryNormal to get the mid point ...