On a map, a closed shape defined by a connected sequence of x,y coordinate pairs, where the first and last coordinate pair are the same and all other pairs are unique.

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28 views

cut off part of catchment

I want to edit a polygon as that I cut off a part of it. I want to freely make a line that define where the polygon should be seperated. I have tried to useedit vertices but it does not seem to be a ...
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1answer
61 views

problems using the Split Features tool [closed]

i'm using the split features tool to create two polygons from a bigger one. The problem is, when i save the split i have done, half of the polygon disappears. But sometimes, after doing some more ...
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1answer
184 views

Problems with Polygon Reshape Feature

I'm new in this forum, and i need some help with my project. I've created a polygon and closed my project, after opening the project again, i can't use the Reshape Feature tool in that specific ...
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1answer
367 views

How to calculate the percentage of distribution in each polygon?

I have binary map for disease suitable area and I want to calculate the percentage using pixel count in each polygon how can I do that? I use zonal histogram and do have frequency for each polygon is ...
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1answer
55 views

ArcGIS10 Highest point via polygon features

I am using ArcGIS 10.0 with 3D Analyst, Spatial Analyst and Military Analyst. I feel like I am halfway to solving a problem but do not seem able to completely solve it. I have a polygon shapefile ...
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1answer
405 views

Search for geojson polygon in mongodb implementing a custom vector tileserver

I am building a vector tileserver in node.js using mongo 2.4.7 as database. My database contains geojson data from multiple sources and they are in many layers. It is important to render the layers ...
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2answers
1k views

How to get WKT or GEOJson by country or city name with Overpass API?

I'm trying to understand Overpass API, I'm experimenting with it, but cannot get what I expect. Overpass API doesn't return me neither polygon shapes, nor WKT, nor GEOJson, nor even a highlight of the ...
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1answer
83 views

Openlayers selection

Is it possible to select a polygon from a predefined Lat & Lon programmatically? eg location point: x='1234' y='5678' intersects polygon '1234', therefore SELECT POLYGON '1234' So far I have ...
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113 views

How to get average polygon? [duplicate]

Is there a way to get an average polygon of unioned stack of polygons in ArcGIS 10.0? I would like to get an average polygon that would be centroid (but polygon) of whole stack of polygons.
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297 views

How to convert OSM polyline data to polygons?

I just now downloaded OSM data .I am having the data as polylines. I want that polylines as polygons is it possible in Qgis?below I also posted the screen shot of the polyline also.
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207 views

Polygon grid shape file for landmass

I am interested in generating a polygon grid shape file for the landmass of the world. What I have presently is two tables in postgreSQL. Table 1: Coastal area shapefile ...
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1answer
171 views

How to count number of stores per company per region?

I have two layers. One point layer and a Polygon layer. It is simple to count the points in the polygon layer by the "points in polygon" function. But I also need some more information of the point ...
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1k views

How do I write a MYSQL spatial query to find all polygons (rectangle) that contain any points in a table?

Something like: SELECT * from polygons WHERE bounds CONTAINS(SELECT geom_point from points) Can someone help me out with the syntax? Bounds will always be a rectangular polygon and everything is in ...
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1answer
79 views

Converting an Experian (Geoconcept) file to GPS coordinates

I'm working with a file containing Experian data which was used in Geoconcept. The file describes a serie of microzones, that is polygons. Unfortuntely the coordinates system is hard to understand: ...
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1answer
70 views

How can I know the number of polygons in a selected area in QGIS

How can I know the number of polygons in a selected area in QGIS? Can I use the Select features tool? How can I use? Thank you
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4answers
171 views

How can I calculate different polygons by different attributes?

I'm doing my master thesis and want to calculate different polygons (in QGIS 1.8 for Mac) in four different columns which I defined by different attributes. i.e. some of the attributes in the first ...
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1answer
259 views

How to find and quantify duplicate vertices on a polygon/polyline in ArcGIS 10.0

I need to clean up topological errors in various shapefiles and databases. I did read that the Repair Geometry tool could clean duplicate vertices but how can I know the number of errors before and ...
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1answer
494 views

Reverse geocoding polygon co-ordinates?

I have a large dataset of polygons for property sections that I need to reverse geocode. It was recommended that I use a GIS like Quantam to do this however from my research I am not 100% sure if a ...
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2answers
368 views

Where to find the variables of QgsPolygon and QgsPolyline?

now I want to use QgsPolygon (and Qgspolyline,too) class in python I have a example by using QgsPoint but I don't know how to use in QgsPolygon following is my Qgspoint example feature = ...
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1answer
130 views

QGIS create point data attribute as the name of the polygon it falls in

I'm working in QGIS with a point data set overlaying a farm with 140 fields. While I can analyse the points from each field individually, I would rather use an awk script to calculate statistics I ...
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2answers
46 views

Field within a Field - Donut Parcel?

Firstly, apologies as I'm a newbie and have only been studying GIS for a few months. I am digitising field boundaries and have a field within a field, and am wondering what the best way of ...
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1answer
367 views

matching a border of one polygon to another [duplicate]

I have a polygon (A) that I drew the eastern border of in QGIS. I have another polygon(B) whose western border I want to nest against the eastern border of polygon a so they are touching but not ...
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1answer
97 views

Selecting a Polygon based on the location of a point

Currently I have a polygon layer made up of three shapes. All the shapes are listed in the attribute table. One of these three shapes intersects a point. I would like to select just the shape that has ...
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1answer
761 views

Geojson multipolygon doesn't work with Leaflet bindPopup?

I have polygon and multipolygon data in Geojson format and when I try to bind popup for polygon, it works perfectly, and when I try to bind it for multipolygon, it doesn't work. Is that some Leaflet ...
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1answer
614 views

OpenLayers polygon fill not working with GeoJSON file as source

I'm trying to visualise some data in a custom shape on a map, and I'm stuck with styling it. I'm currently using the openlayers framework in combination with a geoJSON file that I generate in code. ...
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1answer
3k views

How to divide polygon layer into multiple layers by values in attribute table column in ArcGIS 10.1

I have polygon layer with multiple types of area (forest, grass, and many more), and I´d like to divide this layer into many layers by the area type. I´ve tried Split function but I receive an error ...
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1answer
166 views

How to add a label of a point to a polygon

i have several polygons with in each polygon a point with a label (number). I want to add the label in the polygon to the attribute-table of the polygon it belongs to.
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1answer
444 views

In DIVA GIS how can I change the polygon co-ordinates of a .shp file?

I am using polygon layers from various sources to create species distribution maps however some of the layers have different polygon coordinates to others, therefore I cannot use them together as ...
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1answer
461 views

table of polygon centroids

Given a polygon layer, census tracts, how can I generate a table of centroid coordinates in QGIS, or add columns with the centroid coordinates or generate a new layer of polygon centroid points?
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1answer
413 views

To get attribute data of polygon layer by giving Lat/Lon

Is anyone having an idea about how to get attribute data of a polygon layer by giving Coordinates with in that polygon. Here i have tried with these codes.. SELECT * FROM kar_bbmp_198 WHERE ...
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2answers
824 views

How can I convert Polygon to LinearRing Geometry?

How can one convert a Polygon to LinearRing geometry using OpenLayers? I'm thinking that I can do this by getting bounds of the polygon, then use this to construct a Points array. Finally, use ...
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2answers
350 views

How to retrieve a single polygon from a multipolygon layer in GeoServer

I have a multipolygon layer in GeoServer. The layer represents states within a country. I want to enable a user to search for a specific state, and then only the selected state to be displayed on the ...
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2answers
1k views

Calculating shape perimeter/area per zone in ArcGis 10

How can I calculate geometrical features of polygon (perimeter and area) per zone (similar to zonal stats for rasters)? I have a square fishnet (approx 20x35, 1 square kilometer each) and I need to ...
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3answers
244 views

How illustrate cells in attribute table?

Firstly, many thanks to all of you who have been helping me greatly, just can say THANKS. Secondly...I have a new question. I have an attribute table with 2883 rows which are the OA of Leicestershire ...
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0answers
3 views

What replaces SQLserver SqlGeometryBuilder, for Windows store apps?

Porting Visual Studio 2008 C# application to Visual Studio 2013, Windows 8.1 store\phone app (need to include DB with the application). What DB to use (coding in c#), to replace this code, not sure ...
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0answers
23 views

How can I redistribute points within a polygon using certain criteria in ArcGIS?

I have some points (representing pharmacies) scattered around my research area and I would like to redistribute those points through the area using the following criteria: The points should ...
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0answers
36 views

Polygon of Voronoi cell using scipy.spatial?

I have points (e.g., lat, lon pairs of cell tower locations) and I need to get the polygon of the Voronoi cells they form. from scipy.spatial import Voronoi tower = [[ 24.686 , 46.7081], [ ...
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0answers
60 views

Polygon vertex “duplication” in QGIS?

New QGIS user, Brighton 2.5. When creating or moving new vertex points of a recently-cut polygon (hence adjacent polygons) I get "duplicate" or "criss-crossed" lines beneath the former vertex ...
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0answers
20 views

ClipRaster Class of DotSpatial is problematic

I want to clip a raster data with a polygon extent. Here is my Layers. Polygon layer is colored and raster is black and white. When I cliped using ...
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0answers
19 views

Stack profile - polyline length

I have created a polyline that stretches from one side of a beach to the other (vertically). I have lidar data for 2005 and 2013. I am trying to compare the changes in morphology of the beach from ...
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1answer
31 views

Create polygons from point dataset, where each polygon contains 3 points from the dataset

I'm using qgis Brighton I have a dataset of 1500 points. I want to create polygons, where each polygon contains n=3 points from the dataset. The aim of this is to have clusters of 3 points, which ...
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0answers
20 views

Drawing polygon with predetermined area

Is there an option in quantum gis to draw a polygon with the specyfied area and is it possible to display dynamically the area when reshaping the shape of the polygon ?
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1answer
45 views

How to avoid 'join features by location' for polygon to polygon creating extra areas

I am trying to work out which large polygons contain smaller ones within them in QGIS. I have a set of smaller features already defined (dark green below). However, for those smaller areas which sit ...
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0answers
26 views

Zipcode to Polygon/Boundry

Is there any API out there which can give me Polygon value for a zipcode? I really thought that it would be fairly easy for me given the number of Maps APIs out there. Either Google Maps API or ...
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1answer
42 views

How to export to all points within Leaflet polygon?

I dont have any idea If it is possible to export all points within a draw polygon. (http://leaflet.github.io/Leaflet.draw/). Thanks in advance.
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2answers
53 views

Intersection between line and polygon

I have 2 layers in openlayers: first is parcel layer (polygons) and second is railway layer (lines). They are already drawn and all i need to do is when i click on some line, to get intersection of ...
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0answers
31 views

line features show up as polygons in GeoServer

the layers are located in a postgreSQL Enterprise Geodatabase. I created a new line feature class and added it to the database and then added it to geoserver. But in geoserver it comes in as a polygon ...
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1answer
52 views

Converting polyline data to polygons?

I am trying to convert some polyline coastline data into a polygon that I can use to clip/subset back other data sets by this polygon. There are some small gaps in the coastline data, which ...
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0answers
38 views

Is it possible to calculate area of polygons from GPS points without POSTGIS

I am new with GIS. Assume we use the UTM30N coordinate system. Is it possible to calculate an area (say a square box) by the 4 given points? (assume the points are in order, and the coordinates are ...
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1answer
38 views

.net arcobjects draw polygon(rectangle) can not start at the preferred location

I am using the sample code (draw a polygon on the screen) provided by Esri but it seems I cannot start the drawing from a location I want, every time it starts at wherever the function(or tool) ...