Geo @ ObjectGraph

Earth and Environmental Science Blog

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Posts Tagged ‘arcgis’

Introduction

The goal of this project is to visualize a specific WiFi SSID strength on a map. WiFi signal’s strength is affected by the distance from the antena or obstructions between the receiver and the antena. In this article, I collected data in a small shopping mall in Long Island. WiFi strength was measured on iPhone and the value will be directly sent along with coordinate information to Google Fusion Tables. After collecting data, analysts are able to create map on the fusion table itself or download it as csv to import in other GIS software, such as ArcGIS.

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Introduction

My previous posting covers how to import data from ArcGIS via KML format because KML is the format that Google Fusion Tables accepts. Yesterday, I found a website, shpescape.com, which takes your shape file (.shp) and import it into fusion tables for you. This blog article is not really tutorial because the website is simple enough to use it. However, people who interested in how things work, I’m introducing the walk-through here.

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Python and Geometry

Introduction

GDAL/OGR is a handy and heavy duty geometric library in Python. If you use any GIS systems, you often see “Python Console” which allows you to calculate complicated spatial computation. In GIS software, you can do this using your mouse (e.g. ArcGIS Toolbox and Spatial Analysis Extension); however, you need this technique if you need to customize or automate the process. I start using this library since I’m taking GIS course at Long Island University. In this blog entry, I would like to have an introductory tutorial how to handle geometry in Python using GDAL/OGR. If you do not have a Python setup, the easiest way is to open up Python Console window in GIS system. ArcGIS has python console but if you do not have access to ArcGIS, I recommend to use QGIS which is an open source software for free and it’s available for various platform. Since I’m using Mac, I’ll show those examples on QGIS below.

Download QGIS

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