Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

Oracle MapBuilder generates three types of layers - theme, base and tiles. I try to create algorithm for tiled layers. Have you any idea how to decode this?

I mean algorithm for width and height of tiles.

For a tiles is generated XML like this:

<map_tile_layer name="TL_TEST" image_format="PNG" http_header_expires="168.0" concurrent_fetching_threads="3">
   <internal_map_source data_source="10.0.0.57_lrs" base_map="BM_AGC" bgcolor="none"/>
   <tile_storage root_path="/temp"/>
   <coordinate_system srid="2180" minX="-413374.575" minY="193748.248" maxX="1418971.699" maxY="766162.025"/>
   <tile_image width="256" height="256"/>
   <zoom_levels levels="11" min_scale="1.0" max_scale="1.0E7" min_tile_width="0.06773333184979038" min_tile_height="610782.0913333333">
     <zoom_level level="0" name="level0" description="" scale="1.0E7" tile_width="610782.0913333333" tile_height="610782.0913333333">
     </zoom_level>
     <zoom_level level="1" name="level1" description="" scale="1000000.0" tile_width="65440.938357142855" tile_height="65440.938357142855">
     </zoom_level>
     <zoom_level level="2" name="level2" description="" scale="100000.0" tile_width="6761.425365313653" tile_height="6761.425365313653">
     </zoom_level>
     <zoom_level level="3" name="level3" description="" scale="10000.0" tile_width="677.1420081300813" tile_height="677.1420081300813">
     </zoom_level>
     <zoom_level level="4" name="level4" description="" scale="1000.0" tile_width="67.73172195320296" tile_height="67.73172195320296">
     </zoom_level>
     <zoom_level level="5" name="level5" description="" scale="100.0" tile_width="6.773322418713311" tile_height="6.773322418713311">
     </zoom_level>
     <zoom_level level="6" name="level6" description="" scale="10.0" tile_width="0.677333243384311" tile_height="0.677333243384311">
     </zoom_level>
     <zoom_level level="7" name="level7" description="" scale="5.0" tile_width="0.3386666216921555" tile_height="0.3386666216921555">
     </zoom_level>
     <zoom_level level="8" name="level8" description="" scale="4.0" tile_width="0.2709332973537244" tile_height="0.2709332973537244">
     </zoom_level>
     <zoom_level level="9" name="level9" description="" scale="2.0" tile_width="0.13546665869200755" tile_height="0.13546665869200755">
     </zoom_level>
     <zoom_level level="10" name="level10" description="" scale="1.0" tile_width="0.06773333184979038" tile_height="0.06773333184979038">
     </zoom_level>
   </zoom_levels>
</map_tile_layer>
share|improve this question
add comment

1 Answer

up vote 1 down vote accepted

I found similar algorithm, with minimal difference.

scale * 2.54 * tile width(pixels) / (96dpi*100)

This is sufficient response.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.