The objective of using quickbird image in topographical map updating

21-Jul-2018 23:53 by 4 Comments

The objective of using quickbird image in topographical map updating - Pinay adult video chat sites

Because no specific rules actually exist, here we refer to the mapping technical specifications for the traditional scale and 1 : 5000 scale topographic DBs of the Lombardia Region, which is the reference for metric mapping purposes.In particular, the tests carried on refer to the technical specifications version 01/01 [27] that defines the planimetric tolerance allowed for the positioning of single points in a map as follows:(p,q) is the distance between the points p and q measured on the ground.

The territory of Cesano Maderno is almost flat and has a full surface of 11.46 km.The main problem that users must cope with when working with the RTM is its oldness: the RTM is supposed to be updated approximately every 10–15 years, consequently it may be very dated.In this context, high-resolution remote sensing could be easily used for a quick updating of the existent RTMs and associated databases of geospatial information.Pan-sharpening describes a process of transforming a set of low spatial resolution multispectral (color) images into higher spatial resolution color images by fusing a coregistered fine spatial resolution panchromatic (black and white) image.During the past years, different pan-sharpening methods have been developed, such as those based on multiresolution wavelet transforms, on the principal component analysis transforms, or on the intensity-hue-saturation transforms.This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Urban planning using digital aerial photos has become very popular in the past several years, but the use of satellite images for urban mapping and cartographic update was limited by image resolution [1], even if mapping agencies shown great interest in its possible use for their data collection programs.

However, the high-resolution images captured from satellites have been mainly used in the mapping and surveillance of otherwise inaccessible areas, such as areas of military conflict as Afghanistan or Iraq [13, 14].

Some tests have also been carried on to generate new maps in parts of the world that do not have a tradition of detailed mapping [15].

First of all, a single satellite scene covers a large area (from less than 65 km for Quick Bird). Moreover, with few exceptions (e.g., EROS-B), satellite data are multispectral, so they can be also used for thematic mapping purposes (this also applies to the photogrammetric digital cameras such as Leica ADS-40 or Z/I Imaging DMC).

Finally, and that is the most important factor, remotely sensed images of a specific site can be collected with very short revisit time.

When a map is produced or updated it must be tested.