GSI (Geographical Survey Institute) is researching to apply high-resolution satellite imagery to topographical mapping. Previous studies with IKONOS and SPOT5 show its effectiveness. QuickBird has the highest resolution among the commercial satellites. According to prior studies, QuickBird mono image with DEM gave good results for horizontal accuracy and discrimination. We confirmed the accurac...

This paper presents a semi-automated cloud and cloud shadow masking method, developed for SPOT5 satellite data over New South Wales (NSW), Australia. As clouds are very similar to several surface features in these data, attempts at using traditional image classification techniques have not been effective. The new method uses morphological feature extraction, where marker pixels are identified u...

To assess the status and changes in distribution of seagrass beds coral reefs Phu Quoc from 2005 to 2018, we utilized high-resolution multi-spectrum satellite images, aerial photographs, Google maps. We collected data three time periods: (using ASTER with 15 m resolution), 2010 SPOT5 10 2018 SENTINEL-2 resolution). also conducted an accuracy assessment 78 key sites March-April 2019, representin...

To evaluate the capability of SPOT5 HRG data for monitoring the pollarding forest areas in northern Zagros, some parts of pollarded forests located at Baneh city were selected. The Pollarding area was determined as ground truth in a 3-year alternation period using a Global Positioning System (GPS). Radiometric and geometric correction, were applied to the image and then the data was pre-process...

Monitoring of ice velocity field is one of the key issues to glacier dynamics understanding. Surface velocity fields can provide useful information on phenomena such as glacier surges or ice fall. They can also reflect the effect of global warming on the dynamic of ice masses. Although the surface displacements of glaciers can be monitored locally with ground GPS points, this solution is diffic...