For my last posting @Mapping is an activity-indoor and outdoor, I enumerated the various choices we have when performing the activity of mapping spatial objects and non-spatial objects. Principally since our focus is on spatial objects and the environment around us, it is better we break right into how satellite imagery data we acquire from the activity of mapping can become useful to us all.

Our area of study is a Cadastral Layout of Landed parcel that have been allocated for development and the objective is to analyze the data available and illustrate the level of development that has taken place in the Landed parcels between the years 2012 and 2015.

Our Data are two forms- 2015 Google imagery of the Cadastral layout showing the Landed Parcels in different levels of development. For purposes of this study, development is rated as fenced, uncompleted or completed building 2) 2012 Open street Map Imagery of the same area in ArcGIS Online.

What did we do  – We digitized the Land Parcels that had shown a form of development (fenced, uncompleted or completed building) on a Jan 2015 Google Imagery of the layout. Click the link below to see dataset on Google maps engine,

Parcels Developed in Study Location as at Jan 2015)

Secondly we added digitized Land Parcels on the 2012 Open street Maps in ArcGIS Online to produce a feature layer of Land Parcels that had been developed by 2012. 

Next, We upload the vector layer into ArcGIS online.to do a Compare analysis using a Web application. ,

Here is the result, join us to analyze!!!!

       Zoom in to 250% for best view.

The map on the left are Parcels developed by 2012 while the one on the right are Parcels developed by 2015. 

Its now easy to analyze which new parcels have been developed, though due to the static nature of the map, we cannot get more attributes.

Hope you have enjoyed my post as I enumerate how we can also carry out mapping activity using satellite imagery. I know many of you folks will prefer that but watch out for my next post because there might always be need to see things for yourself outdoors,

Your comments are invited