How to Digitize Road Network in QGIS

In this video I will present how to digitize Road Network in QGIS
Digitizing in the realm of GIS is simply the act of taking a piece of geographic information, such as a map or raster image, and turning it into vector information. This process has existed since the advent of GIS in an analog format. This old manual technique involved a table (digitizing tablet) and a puck, which was a mouse-like device that the operator used to created points, polylines and polygons. This technique was mostly used to import existing physical paper maps and aerial images into a machine readable format. Luckily, we’ve come a long way since the juvenile stages of GIS, and there are now several pieces of software we can use to perform digitizing on digital images and maps; including open source options like QGIS.
Digitizing is important because it lets use do inquiries on the geometry of the produced vector data. For example, we can query the area of a polygon or length of a polyline. We can also do statistical operations on these queries, like determining the mean area of all the polygons belonging to one ground type class. It also makes the image more readable by classifying ground features.

Often times aerial images are taken of landscapes however, boundaries between land-use classes are often quite difficult to see without any visual modifications. Not only does digitizing help visualize spatial data, but it also often allows for much more interpretation. Converting aerial image data into vector shape files opens up possibilities for a wide variety of spatial analysis. Thematic maps in GPS programs often use some sort of digitization as the majority of their data is derived from aerial images and that data would not be sufficient for travel within a city (Google Maps, Waze etc.)
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#vectordata #vector #line #roadnetwork #digitization
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[ΙλιαδαΜπ]

Hello and thank you for this helpful video. After this step, is it possible to calculate how many km are the streets and and also have the same time the municipality's boarders? In order to calculate in a specific area how manh km are in area?

[Redux]

For a routable road network you have to break the edges at the intersections!

[AliSuperTech]

Kindly share the code of calculating NDVI of Gilgit Baltistan