The following example uses the “Must not have dangles” rule to identify polylines from a roads dataset that are not snapped to other lines.
Create a ring around a point in mapinfo 10 software#
You may have to use queries if the GIS software you’re using doesn’t have a topology feature. Calculate the Count field to equal to 1 by right-clicking the field name, and clicking Field Calculator. In the attribute table of the point shapefile, create a field called 'Count' of type 'Short Integer'. Advantage of topology over queriesĪ lot of the checks that topology rules carry out could be achieved using spatial queries. Create a count field and a spatial join between the point shapefile and the polygon shapefile. If you are editing a table, and you draw a line on top of a circle, the line might. An example is that features in a road dataset must be connected to other roads at both ends, unless the road is specified as a dead end street. Prism Map F10 Creates a prism map using the current Map window. #> Linking to GEOS 3.5.0, GDAL 2.1.1, proj.4 4.9.Topology rules define the permissible relationships of features within a given GIS layer or between features in two different GIS layers. The beauty of sf is that it integrates (almost magically!) so well with dplyr - see the last step. I don't know the correct one for Switzerland, but I found this SO answer and used that. One thing I didn't mention is that you will want to transform to an appropriate equal-area projection that uses metres so that you can buffer by 100m and be confident that the areas calculated across your study are equivalent. Return a data frame where each row (polygon) contains the area covered by the circles.īonus points if this can be done in Simple Features.Įssentially what I mentioned in my comment. mean_lat = "Ticino")Ĭreate circles with a 100m radius in the dat_sim, to overlay onto the shapefile dat_ticino_sf or dat_ticino_sp files.įor each polygon in the shapefile, calculate how much of that polygon is covered by circles. Here I create some simulated data points.
This will make it so that the bearing doesnt move. The last step is to right click on the inner bearing ring component and select 'Ground'. Under 'Motion' make sure the joint type is 'Revolute'. Select the inner and outer bearing rings as the 'Components' and the center point of the inner bearing ring as the 'Position'.
Create circles that have a 100m radius, from a ame of long/lat points How can I add a radius of specified length to a map point I want to see a radius circle, say 60 miles, placed around the center of Tokyo - so I can examine what lies that distance.Specifically, I want to do the following:
My use case is related to calculating the area of a polygon in a shapefile that is covered by another polygon.