Quantum GIS is an open source and free GIS software for geospatial data processing purposes. Quantum Gis capabilities are similar to commercial GIS software such as ArcView, ArcGIS or MapInfo Professional.
Many things we can do with Qunatum Gis, Desktop-based mapping app and can run on four operating systems like Linux, Unix, Windows (32-bit or 64-bit version), Mac OSX, and Android. Spatial data processing is very easy to do because Quantum Gis does not require a lot of space to work, unlike most other mapping applications that require large storage space and must purchase licenses. Recently Quantum Gis developers have released a new version of QGIS 2.18.16 'Las Palmas' and released in 2018/01/19.
On this occasion we will learn how to get Google satellite image data that has been georeferenced and digitized to create a river map, to do this work we need a good internet network because to download satellite image data.
Important ..
Lack of internet network in doing this work can
resulting in the resulting data damaged or unusable and more
worse Quantum Gis can not display satellite imagery map on the screen, so look for a good internet network to do this step.
Let's start
Run Quantum Gis from Desktop with Windows or Mac operating system, as shown below.
Install open layer Plugins so we can download satellite data
Zoom to the desired location and Save image as in Tiff image format
and specify a storage location
Call back the previously stored Tiff image file, now we can
working with satellite images in offline position in Quanum Gis.
Create a new Shapefile in the form of polygon and specify the reference cordinate and Zoom in to
the location you want to digitize
Click the editing tool
Click the add feature tool and start digitizing the river as in satellite imagery and
right click on the mouse to save the features that have been done.
Click the editing tool and save it, until here we have managed to create one
vector stream data with Shp format.
Easy instead, then we just digigitize other objects as needed each. Thank you and good luck.
Posted on Utopian.io - Rewarding Open Source Contributors