(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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0answers
99 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
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1answer
180 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
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0answers
25 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
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0answers
51 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
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1answer
96 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
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1answer
63 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
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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
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1answer
212 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
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1answer
579 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
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0answers
38 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
474 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
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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": ...
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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
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2answers
145 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
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1answer
184 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
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1answer
88 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 ...
0
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2answers
287 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
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1answer
234 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
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0answers
61 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) ...
0
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0answers
121 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
96 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
92 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
110 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 ...
6
votes
3answers
1k 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
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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
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1answer
65 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
226 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
134 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 ...
1
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1answer
759 views

How to resolve the postgis “type geometry does not exist” issue on installing tiger_geocode extension?

I have installed postgis extension in my db. I have few columns associated with its type in few tables and now I would like to use reverse geocode functionality in my app. Hence I tried to create ...
2
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0answers
43 views

how to register view geometry made by MakeLine function?

I am trying to to create a spatial view on my spatialite database. CREATE VIEW v2_pump_view AS SELECT pump.ROWID AS ROWID, pump.id AS pump_id, MakeLine( ...
6
votes
2answers
358 views

Draw SQL server geometry records as graphics on map using ArcGIS API for WPF 2.4 -can it be done and how?

I have records (of public festivals changing daily) in the in SQL server 2012 that have a geometry column (polygons where they occur). I need to show the records as graphics on a map using ArcGIS ...
1
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2answers
35 views

Geographical Field Points of a Boundary

I gathered field points with a TOPCON hand held receiver. I saved the points as a shape file and brought them into arc map. I used the editor tool to connect the points and created a polygon. Is ...
3
votes
2answers
92 views

Construct curve of equal distance from two straight lines

Given two straight lines defined by two points each, I want to get the line which separates points nearer to line a from points nearer to line b. The attached PostGIS code is an example case, it finds ...
0
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0answers
31 views

PosGIS: Longest line connecting point to line

I have a point and around it lines and polygons in the rule of obstacles. I want to connect the point to each of the lines, with a line, such that this connecting line is not intersect any obstacle ...
1
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0answers
43 views

sql server geometry find points intersection buffer

How do I find the point of intersection of buffer?
1
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1answer
73 views

GeoTools Geometries lost when storing features to shapefile [duplicate]

As you know, the geometry column name of schema for saving into a shapefile must be "the_geom". I have a SimpleFeatureCollection with a schema, geometry name of which is not "the_geom"; It is ...
2
votes
1answer
97 views

Testing if Geometry is convex using JTS?

I'm using the Java Topology Suite and I'd like to efficiently check if a Geometry (a Polygon in fact) is convex or not. I currently do if (geometry.convexHull().equals(geometry)) but obivously that ...
0
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0answers
14 views

Representation of streets/highways Geometry

I have Navtech data which provides center-lines with geometric data of the roads. The most important data for me is that it gives me the width of the road as well as the number of lanes for most of ...
0
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0answers
173 views

Drawing Zoning Setback Lines

What would be the process for drawing zoning setback lines for a property parcel polygon? I'm looking for a software agnostic solution - just a walk through of the general steps with enough detail ...
1
vote
1answer
46 views

Looking for geometries defining the boundaries of Canadian Location Code regions used for Meteorological Services in Canada

To be clear I have looked into the GADM datasets. The problem is that Canada has a very non-standardized level-2 Administrative Zone identification across the various Territories and Provinces. As a ...
0
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0answers
79 views

Remote SQL Server, Crystal Reports and Geospatial Join

I have: A remote SQL server (2008 R2) that I have access to (But NOT full control of) which contains my source data including OSGB 1936 Geometry [ESPG: 27700] In house SQL Server 2008 R2 A Crystal ...
0
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1answer
38 views

Double geometry coloumns in an xy event layer (ArcGIS 10.0)

I want to convert an annotation feature class to a shapefile. The annotation feature class is stored in a file geodatabase. I add two columns (x, y) for the centroid coordinates (calculate geometry) ...
1
vote
1answer
55 views

sorting polygons extracted using Fishnet

I generated polygons using fishnet in ArcMap, since the polygons didn't fall exactly on top of my raster image, I had to edit and move some of them. Now the FID of my polygons are all messed up, and ...
0
votes
0answers
111 views

How to create a polyline using multiple points using a PostgreSQL query?

I'm trying to use point data to create a polyline to show my bus route. Initially began with coordinates and used this to create geom using the ST_MakePoint function (written to the BusRouteData ...
1
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0answers
21 views

QGIS 2.0.1 Translate Feature

I have a layer containing linestrings and want to move those that are too close to each other. I seem to be missing something in the moving part though: layer = iface.activeLayer() def moveFeature ...
2
votes
2answers
148 views

Merging lines (that might cross) at common endpoints without multi-part features in the result

I have a polyline dataset I'm trying to merge / dissolve segments based on an attribute into continuous single lines. The problem is that some of those segments cross each other but need to be ...
9
votes
2answers
91 views

Fuzzy least-coarse common partition algorithm

Given two different partitions of a shape (for argument's sake, two different administrative divisions of a country), how can I find a new partition into which both of those partitions fit, allowing ...
0
votes
2answers
90 views

Using ST_LINE_INTERPOLATE_POINT in OGR and python

I'm interested in finding the midpoint on a linestring using OGR and python. This can be a line with more segments. Could I use the ST_LINE_INTERPOLATE_POINT in python using the ExecuteSQL() method? ...
2
votes
0answers
108 views

how to orthogonalize building outlines

I'm looking for a way to orthogonalize building outlines which I've extracted from a high-res DEM. I'm using the FOSS GIS stack (QGIS, GRASS, SAGA, PostgrSQL, PostGIS) and can code in Python (or ...
1
vote
0answers
37 views

Geometry Calculation in QGIS [duplicate]

I'm trying to calculate the area of some census tracts in qgis I go to vector -> geometry tools -> export/add geometry columns in the resulting dialog, I calculate using project CRS. What comes out ...