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Export ArcGIS files to Google Earth (.kml)

Sandra Expósito Rodríguez — Thu, 23 Apr 2015 14:28:00 +0000

Arctoolbox in Arcmap includes a specific tool to export shapes, rasters and maps to Google Earth.

First of all we need to make sure that our layer and layers ready to export have their coordinate system defined.

Next, we open Arctoolbox and double click Conversion tools > to kml. If we want to export a shape or raster, select Layer to Kml. Similarly, if we are interested in exporting an already prepared map to Google Earth, select the option Map to Kml.

We will add the layer that we want to export (Layer), followed by the location and name where we want to save the file (Output file) and we will fill the Layer Output Scale with 1.

The dialog box that opens next, allows limiting the extension of the layer to export with another layer or through coordinates (Extent properties), the resolution (pixels) of the layer that will open in Google Earth (Output image properties), etc.

Next select OK.

Finally we open Google Earth to load the KML file. Select File > Open.

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ArcGIS for Smartphones and Tablets

Sandra Expósito Rodríguez — Mon, 20 Apr 2015 13:19:16 +0000

ArCGIS for smartphones and tables is a free ESRI application available for download on the Apple AppStore, Google play, Amazon Appstore and Windows Phone Marketplace.

From the ArcGIS app you can use and discover maps from all around world. You can use your current location and the information about that location in such a way that you can discover new places to visit. You can use it to make queries, find interesting information, measure distances between points, find areas of interest to share with other users, etc.

You can also use online maps. ESRI offers an online GIS, ArGIS Online. You can also use ESRI´s tool to create your own maps. If you are already an ESRI´s client, this application is already part of your ArcGIS system.

Improvements made on smartphones allow the development of powerful mapping applications to be used on them.

Some of ArcGIS app extraordinary and unique characteristics are described below:

– Navigate maps with just one click

– Use online maps created by ArcGIS.com

– Access your personal GIS data from where you are situated

– View and pan to your current location

– Use the integrated GPS or map to find and update GIS data

– Attach images or videos regarding the information gathered by the map

– Make measurements in the map (linear or area)

– See the attributes information of the layers

– Change the visibility and symbology in the layers

– Change the layers visibility in the map

– Share your maps

This is just a small list of all features available on ArcGIS App for smartphones. ArcGIS is one of the best applications in areas related to GIS and it has extended its geographic analysis capability, its cartography and the creation of data for smartphones.

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How to create a slope Map from a Digital Terrain Model in ArcGIS

Sandra Expósito Rodríguez — Tue, 24 Feb 2015 09:57:00 +0000

Let’s learn with this post how to create a slope map from a Digital Terrain model (DTM) using ArcGIS 10.

First of all, it should be explained what a Digital Terrain Model (DTM) is. It was first defined by Miller and Laflamme in 1958 as “a statistical representation of the continuous surface of the ground by a large number of selected points with known X, Y, Z coordinates in an arbitrary coordinate field”.

Through this exercise, we will be using the MDT05 product from the download service available at the IGN (Spanish Geographical Institute), and in particular we will work with the 559 sheet (City of Madrid).

Since the ASCII format is not really a raster and therefore we cannot use it as a TDM, we first have to transform this ASCII file to a raster file. For doing so, we will use the ASCII to Raster tool, available in the ArcToolBox:

>Arctoolbox > Conversion Tools > To raster > ASCII to Raster

Input ASCII raster file: our ASCII file
Output raster: the folder where we want to store our raster file

Once transformed, don’t forget to Define the Projection to the layer create so that it is properly located, and therefore it creates our slope map correctly.
After doing so, we will be ready to create the slope map using the SLOPE tool, found in the ArcToolBox:

>Arctoolbox > Spatial Analyst Tools > Surface > Slope

Input raster file: our raster file
Output raster: the folder where we want to store our raster file
Output measurement: select Percent_rise to obtain the layer divided in slopes

Attention! To be able to work, don’t forget to activate the Arcmap extensions. Go to Customize > Extensions

We will obtain a slope raster layer in % that uses colours that go from green to red as shown below:

To obtain a layer that is more clarifying, we can change the symbology. We will obtain a more intuitive and easy to handle slope map, like the following:

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How to delineate a TIN dataset using ArcGIS

Sandra Expósito Rodríguez — Thu, 19 Feb 2015 08:16:38 +0000

When cropping a Triangle Irregulated Network (TIN) dataset it is important that it preserves the elevation values from its edges. If not, these zones will interpolate to elevation value 0.

How to solve this problem? One of the possibilities is to create a polygon that includes elevation data from the Digital Elevation Model (DEM):

1. Create a polygon that will act as the limit.

2. Add the surface elevation information to this polygon using the Interpolate Shape tool.

ArcToolbox > 3D Analyst Tools > Functional Surface > Interpolate Shape

3. Add the fields as shown:

Input Surface: the TIN that we want to delineate (tinc_final)

Input Class: the limit polygon (Limite_TIN)

Ouptut Feature Class: Specify the directory and output exit name of the interpolated polygon

4. Cut the TIN with the Edit TIN tool

ArcToolbox > 3D Analyst Tools > Data Management > TIN> Edit TIN

*Before applying this tool, it is recommended to create a security copy of the initial TIN to avoid losing information if the editing result is not the desired.

5. Input TIN: the TIN to delineate (tinc_final)

6. Input Feature Class: the interpolated limit polygon (limite_tin_interp)

Indicate the SF type as Hard_Clip. This means that it uses it as a clipping to delineate the TIN.

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