Data collection is subject not only to GIS but is a wide process regardless of the field of study. However, while GIS is growing up, the process of data collection becomes more and more demanding and has been evolved into a sub-category of science with methods targeted at collecting data for GIS. Data collection includes other sub-categories such as data capturing, and at this point, it would be useful to point out their difference. Data capturing is most assigned in digitizing the data when entering the GIS system, while data collection is a process referred to the sources and information we gather, aimed at specific parameters, in order to insert them in GIS and create. Other sub-categories of data collection are data sampling and data transfer.
It is widely known that GIS is a very useful tool, it can be combined with almost every field of study and place information on the map so that to draw conclusions effortlessly. Below we will see what kind of data we can find during data collection and the methods we use to find them.
Becomes easily perceived that for the data collection process we need firstly data and information to create the base map and then information about the layers which are going to overlap the map. Therefore, the data needed for the base map belong in a category named “primary sources” because these spatial and location data are received for direct use in GIS in digital format. The other category of data is called “secondary sources” and refers to data of general interest gathered for any reason which can further be used in GIS after appropriate elaboration. Of course, in the second category may belong also paper maps and other spatial data which are not in a GIS format and they demand digitizing. Moreover, if we use secondary data we have to be very careful and consider if the data are right and when received, otherwise our final result will be wrong and probably outdated. Last but not least, there is a third category which concerns data transfer from a spatial web and online databases.
The main methods used for data collection are the same as the methods used in the process of data capturing. These are remote sensing, GPS, photogrammetry etc. Below we will see some other methods and applications a bit more specialized, for data collection.
There are through the above-listed processes, we have more specialized and scientific data collection., Either we want to create a story map with the restaurants in our area or a map with the surface runoff, it is obvious that there are plenty of sources for data collection. Of course, the main sources are GPS, remote sensing and photogrammetry but all the mentioned methods and applications are useful too.
Stereo images from high resolution and close-range photogrammetry with orthophotos, digital surface model etc.
With years of experience, professional and specialized staff, UIZ company provides information and support to your project in the field of data collection and data capturing for GIS, through remote sensing and photogrammetry. For more information and questions, you can find us in UIZ webpage or call us at +49-30-20679130.