Tag Archives: GIS Basics

Free GIS and Spatial Data Analysis Software

23 Feb

Hey guys,

Just a quick post to tell you about this great software I found recently.

MapWindow seems to have great potential to get layers into a diversity of formats, while GeoDa offers all these facilities:

  • Data Input and Output
    • read and write shape files
    • copy graphs and maps to clipboard
    • save maps and graphs to bitmap file
  • Spatial Data Manipulation
    • create point shape files from text files
    • centroids for polygons
    • Thiessen polygons from points
    • contiguity based spatial weigths for polygons
    • distance based spatial weights for points and polygons
  • Visualization and Queries
    • graphs, maps and table
    • linking and brushing of all maps and graphs, multiway linking of table
    • spatial selection on maps
    • query selection in table
  • Mapping
    • quantile and standard deviational maps
    • outlier maps: box map and percentile map
    • rate mapping and smoothing: excess risk map, Empirical Bayes smoothing, spatial smoothing
    • map movie
  • EDA
    • histogram
    • box plot
    • scatter plot
    • full dynamic linking and brushing
  • Spatial Statistics
    • Moran’s I
    • Moran scatterplot: univariate, bivariate, EB corrected
    • LISA local Moran: univariate, bivariate, EB corrected

    I hope is of some use to you! 🙂

    Converting a single shapefile into several (Split by attribute)

    8 Feb

    Hello again!

    Just a quick note to tell you that today I found a very useful tool set to split a layer or shapefile in many shapefiles based in an attribute from the table.

    This is a very quick way to separate a layer of roads, counties and so on. It was created by the USGS and have also another 3 additional tools.

    I hope is as useful for you as it was for me 🙂

    GIS Tool

     

     

    Changing the symbols of an entire layer in ARCGIS

    1 Feb

    Hello!
    As always, there are small things that make our life easier when we are working with Arcgis. But sometimes, they are so obvious and -small-, that we tend to forget how to do them :p

    This time, a friend had a layer with many roads and he asked me how to do all of them thicker. To change them all at the same time you just go to:

    Layer properties/Symbology/Symbol Tab (above the lines representing each of the roads in this case)
    Left click/ Properties for all symbols

    There you can change the properties of all your features at the same time 🙂

    Happy modelling…

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