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0

I'm sure this function is incredibly inefficient (not to mention that it's coded very poorly -- it was written as a "once-off" quick and dirty implementation), but here's one whose results work quite well for me: CREATE OR REPLACE FUNCTION public.calc_colors( tbl text, unique_field text, neighbour_style text, search_distance real DEFAULT 0) ...


2

It's definitely a major pain when ArcMap tries to be, um, helpful even when you really don't want it to be. One workaround I've found is to create a new temporary dataset, and add a few points with the minimum and maximum values that you know you'll need in the output - just be sure to cover the whole range. Create your symbology based on this fake dataset ...


1

The answers to this question will be heavily opinion-based. The quick answer is: there is no answer, or “it depends”. The slightly longer answer is: it all depends on the data, and on the people who will be looking at the map. For some audiences your first example might be perfect, and for others your second one might be the perfect one. Then again, if the ...


0

In my opinion it depends entirely on the audience and intent of the map. For a scientific audience I would lean toward the true minimum and maximum values of the data set (version 1). For a general audience I would lean towards option 2, as it is more intuitive. But, I would recommend a different color scheme than that used in the second legend, check out ...


2

That looks like Natural Earth Data being used, however as far as creating a map, there are a lot of different aspects that need to go into the process. You need to consider the scope, audience, styling, interactivity, etc. If you need these maps quickly for a project you might be working on, I would suggest hiring a professional, but by the way you worded ...


0

You should see if using ESRI's satellite imagery or Mapbox's satellite imagery will work for what you need. If not, I know DigitalGlobe will sell you imagery, but I'm not sure how much it costs.


2

Perhaps dissolve the polygons together. Another option: within symbology you can select "no color" for the border of the polygons.


0

One more description from Josh on how to implement it in QGIS Very good and detailed tutorial.


1

I coded the sinusoidal intercepted projection in javascript, so it runs in web browser. You can check it here: http://www.winski.net/?page_id=12 You only need to pick your input image, sinusoidal intercepted projection from list of projections, number of gores, and click "project". It is under BSD, so feel free to do anything you want with it :)


1

Answering my own question here in the hope that this helps others (or my future self). In the intervening weeks since I posted the question, I was unable to find an elegant solution to this problem that could be done algorithmically in PostgreSQL. Instead, I broke the task down into constituent parts and more or less brute-forced it. For the purposes of ...


1

I've had good luck using the 6-color algorithm described in the introduction to Two Linear-Time Algorithms for Five-Coloring a Planar Graph. Although it's certainly possible to color a graph using fewer colors, it may not look any better than using 5 or 6. ALGORITHM 6-COLOR. Given an n-vertex planar graph G in adjacency list form, this algorithm ...


1

Another method would be to clip the lines at the city limits. Add a text field to the attribute table, say InCity. Calculate a Y or N into the field depending on whether the line segment is in or out of the city. Then symbolize by that field as desired. For that matter, you may not need a new field if, as you state, some segments lack major road data. You ...


2

I think I can answer your question. I also don't like roads just stopping. This was my solution. I hope this helps. This is my first answer, so please bear with me if I am out of line. 1.I used the drawing tool and created a rectangle over the city roads layer, but just a little bit bigger so the rectangle also contained the roads around the city. 2.I then ...


8

Sometimes when I want to gray-out or obscure features on the map which exceed the edge of the study area, I add a vector layer and use it as mask by setting the color to 'Arctic White' and setting the transparency to around 40%. The mask layer is a simple polygon (a rectangle exceeding the city limits extent) with a hole cut in the center (extent of the city ...


0

You might be able to accomplish this using a gradient symbology. Maybe a color ramp that goes from a color to no color. This would make the object appear to fade away.


1

If you want it done right, do it yourself. This is the unfortunate reality for some projects. One way to get the desired result of having your Dam features perpendicular with the water features is to manually adjust them all. You can do this by Converting features into graphics. This will allow you to rotate those how you would prefer. From there, you can ...


2

This may suit your needs: Create raster layer of your roads (coarse scale is fine). Calculate all cells in raster layer to equal 1. Set a definition query on your potential sites so only the first site is displayed. Calculate the Cost Distance for all roads to that site. Go back to step 3 and set query for next site. Repeat for all 6 sites. This could be ...


1

Depending on the distribution of your points, you could do something relatively simple, such as using the Minimum Bounding Geometry tool to create a bounding box. Ideally you would use a convex hull as an option, but depending on your license that might not be available. In the following screenshot I have, for example, I used rectangle by area: (assuming ...


2

The contrast of the lack of completeness and the amount of detail on this map makes it one of my all time favourites. It is a italian/protuguese world map by Alberto Cantino from 1502 according to Wikipedia. (Gigantic, high resolution images are available on the free web)


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For the contour creation, see How to create contour lines from point data? You can add Natural Earth shapefile boundaries (or any other shaoefiles) as background, or Openstreetmap tiles via the Openlayers plugin.


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About a year ago i've been created a video how to make contour lines from points with qgis. Available here: http://youtu.be/w4fEewn7gz0 Language: hungarian :D


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On the first map you could use a heavy stroke around the Local Authority boundary and rely on the labels to communicate that information. The flood zone could then be hatching fill. Points could then become x and o with x being cutoff LSOA centroids. Hospitals could be the same symbol but black. Rivers are a bit tricky but if you made all 'land' a light ...


0

I have also never been able to view layers in Inkscape with either .PDF or .SVG exports from ArcMap. A fairly close work-around for this problem is to export the .MXD as an .SVG, open the .SVG in Inkscape and then open the Inkscape XML editor (Shift + CTRL + X). Opening a .PDF with Inkscape appears to lose the layer names in the XML editor, so I tend to ...


1

a desktop solution for cartography is Migratio You can import shapefiles and work on it to edit complex maps. You can create maps by menu items or you can write programs to import data and fully setup your presentation.


1

There is a service that allows you to retrieve any administrative border from OpenStreetMap in a number of formats. https://osm.wno-edv-service.de/boundaries/


3

There is a border argument in the plot-method: plot(x, border="grey") R> args(sp:::plot.SpatialPolygons) function (x, col, border = par("fg"), add = FALSE, xlim = NULL, ylim = NULL, xpd = NULL, density = NULL, angle = 45, pbg = NULL, axes = FALSE, lty = par("lty"), ..., setParUsrBB = FALSE, usePolypath = NULL, rule = NULL)


2

If you want to convert it to a Shapefile just download the xml (for example right-mouse-click on the download link and choose something like "save target as..." instead of opening it in the browser. then in Qgis choose "add vectorlayer" or use drag and drop to add your xml layer to your Qgis project. then save layer as shapefile. If you are just looking for ...



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