UPDATING
DIGITAL TOPOGRAPHIC MAPS OF DIFFERENT SCALES ON SPACE IMAGES
{0><}100{>L.V.Vorobyova, A.V.Samokhina, J.J.Tezina<0}
{0><}100{>OOO DATA +<0}
lvorobyova@dataplus.ru
Every year t{0><}100{>tthe question of topographical maps updating becomes more and more actual.<0} {0><}100{>The infrastructure of territories varies very quickly; there is a need for updating the information on greater areas.<0} {0><}100{>One of the variants of solving the problem on updating maps is the development and introduction of the new technologies based on sharing digital topographic maps of various scales in the union with space pictures of the corresponding resolution.<0}
{0><}100{>Why is the question of updating especially actual now?<0}
{0><}100{>First, many cartographical sources have become outdated, and traditional methods of updating do not keep up with fast development and change of territories.<0} {0><}100{>Besides, earlier the specialized geodetic organizations only were occupied with updating of maps, and now came more dynamical private companies on this market.<0}
{0><}100{>Secondly, there were new data of remote sensing (space images with the big visibility of territory and the high resolution), which become more and more accessible.<0} {0><}100{>Reduction in price of pictures and start of domestic satellites promote greater opportunities and prospects in development of this direction.<0}
{0><}100{>Thirdly, with GIS introduction there were new means and the new technologies allowing as much quickly as possible and qualitatively to perform work on map updating.<0}
{0><}100{>We already have a
certain experience on updating maps in scales of 200 thousand and 25 thousand
on territory of the
{0><}100{>For updating maps in scale of 1:<0} {0><}100{>200000 Landsat images with the resolution 15m were used.<0} {0><}100{>Updating of maps in scale of 1:<0} {0><}100{>25000 was conducted on SPOT space images with resolution 2.5m.<0}
{0><}100{>Technological process of maps updating with use ESRI Company software product ArcGIS 9 opportunities has been developed.<0} Updating p {0><}100{>rocess is presented by several stages:<0}
1. {0><}100{>Transformation of an available topographical map layers in the data model developed for representation of digital topographical maps and their use in geoinformational systems;<0}
2. {0><}100{>Processing of space images (a binding, orthophoto transformation, a mosaic)<0}
3. {0><}100{>Actualization of the information on RS data.<0}
{0><}100{>The big attention at maps updating was given to sequence of a map layers updating and preservation of objects topology, and also observance of their graphic correctness.<0}
{0><}100{>Already existing modern maps and atlases of different scales besides the Internet resources (Google, regional sites with maps and photos) were involved as auxiliary materials.<0}
{0><}100{>Besides of the office deciphering, the problem solving was made also in field conditions.<0}
T{0><}100{>he actual vectorial digital model of terrain which can be used for architectural, planning works and other purposes has been received.<0} {0><}100{>The map is issued in standard conventional signs as ArcGIS project as a result of works.<0}
{0><}100{>In the conclusion we shall note, that use of space images is not only useful by updating digital topographical maps, but also convenient for their subsequent sharing.<0} {0><}100{>The most realistic visual image of the space, giving trustworthy information about accuracy and urgencies of spatial data is created in such combination.<0}