Hi All

i m confusing that if scale denominator ratio is 1:50000 then what is this 50000 means?what is its unit is it meter,cm,mm, ??

the other thing is that when we define maxscaledenominator in our SLD lets suppose i define1:181000

the intervel of zoom which i see in openlayer .

what does the one intervel shows

here i m attaching a image in which intervels of zoom levels are shown what does each intervel means the value of?

here are 13 lines of zoom here

1:181000 divided in 13 lines why not 14 or 12???

plz help me solving this mystry

Regards

intervels.bmp (3.75 MB)

Hi,

First, ratio is a plain number so it does not matter if in the 1:50000 scale map 1 mm on the map means 50000 millimeters in the nature or if it is 1 cm on a map and 50000 centimeters in real life. However, web map scales are more mysterious than those with paper maps. This is what WMS standard says about ScalHint.

" Layers may include a element that suggests minimum and maximum scales for which it is appropriate to display this layer. Because WMS output is destined for output devices of arbitrary size and resolution, the usual definition of scale as the ratio of map size to real-world size is not appropriate here. The following definition of Scale Hint is recommended. Consider a hypothetical map with a given Bounding Box, width and height. The central pixel of that map (or the pixel just to the northwest of center) will have some size, which can be expressed as the ground distance in meters of the southwest to northeast diagonal of that pixel. The two values in ScaleHint are the minimum and maximum recommended values of that diagonal. It is recognized that this definition is not geodetically precise, but at the same time the hope is that by including it conventions will develop that can be later specified more clearly. "

-Jukka Rahkonen-

-----Alkuperäinen viesti-----

Lähettäjä: Sila Khan [mailto:silasharmeen@anonymised.com]

Lähetetty: to 29.7.2010 14:59

Vastaanottaja: Geoserver-users@lists.sourceforge.net

Aihe: [Geoserver-users] ScaleDenominators Max and Min

Hi All

i m confusing that if scale denominator ratio is 1:50000 then what is this

50000 means?what is its unit is it meter,cm,mm, ??

the other thing is that when we define maxscaledenominator in our SLD lets

suppose i define1:181000

the intervel of zoom which i see in openlayer .

what does the one intervel shows

here i m attaching a image in which intervels of zoom levels are shown what

does each intervel means the value of?

here are 13 lines of zoom here

1:181000 divided in 13 lines why not 14 or 12???

plz help me solving this mystry

Regards