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2. Jacobsen, K., 2014, Topographic Mapping with High Resolution Optical Space Images.

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3. Diggelen, F., Want, R. & Wang, W., 2018, How to achieve 1-meter accuracy in Android. GPS World.

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4. Medium, 2017, Seven Ways to Improve the Accuracy of Your Drone Maps. 

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5. Psychas, D., 2016, Διερεύνηση και ανάλυση τεχνικών βελτίωσης της ακρίβειας της μεθόδου εντοπισμού PPP με τη χρήση πολλαπλών συστημάτων GNSS. Dspace.lib.ntua.gr.

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6. Lunar and Planetary Institute (LPI), 2020, Topography and Satellite Images.

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7. Earth Imaging Journal: Remote Sensing, Satellite Images, Satellite Imagery, 2014, Creating National Maps with GIS and Satellite Imagery. 

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10. van der Laan, F. and Meijer, P., 2002. Updating Land-use Information On Topographic Maps Using Satellite Imagery Combining The Advantages Of Two Accessible Sources Of Geographic Information.

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