gis - Postgis ST_Transform -

-

i have point (x, y) srid 900913. transform srid 2180 , again srid 900913. imo should have same point, differs. why?

select st_x (st_transform(st_transform(st_geomfromtext('point(21.01233628836129 52.23044648850736)', 900913), 2180), 900913)), st_y(st_transform(st_transform(st_geomfromtext('point(21.01233628836129 52.23044648850736)', 900913), 2180), 900913));

the quick answer why 2 transformations different because of common confusion of projection systems.

the coordinate point(21.01233628836129 52.23044648850736) on spherical mercator projection @ 0°0'1.689"n 0°0'0.680"e, way outside poland, makes difficult or typically impossible reproject else.

the coordinates looking @ most likely longitude/latitude on wgs 84 (epsg:4326).

i think exercise attempting (latlon_check in particular):

select st_aslatlontext(geom) latlontext,   st_aslatlontext(st_transform(st_transform(geom, 2180), 4326)) latlon_check,   st_astext(st_transform(geom, 2180)) poland_cs92,   st_astext(st_transform(geom, 900913)) spherical_mercator st_geomfromtext('point(21.01233628836129 52.23044648850736)', 4326) geom;  -[ record 1 ]------+---------------------------------------- latlontext         | 52°13'49.607"n 21°0'44.411"e latlon_check       | 52°13'49.607"n 21°0'44.411"e poland_cs92        | point(637389.203455155 486840.46005323) spherical_mercator | point(2339082.5759974 6841900.8700405)

Comments

Post a Comment

Popular posts from this blog

windows - Single EXE to Install Python Standalone Executable for Easy Distribution -

-
i used pyinstaller create standalone exe file pyqt project. did not use single file option because exe created single file option takes long open. therefore, pyinstaller created dist folder contains bunch of files including program.exe file. create setup.exe file place contents of dist folder in program directory , create shortcut in start menu , on desktop. want super simple user. maybe setup.exe files when download program cnet. found inno-setup, looks promising. however, not know if there special considerations because program standalone program create python/pyqt program. thanks! have experience task? there program using task not know about? inno-setup or nsis easiest use. tell them files include , put them , create nice installer you. wrote short tutorial on experiences using innosetup might find helpful: http://www.blog.pythonlibrary.org/2008/08/27/packaging-wxpymail-for-distribution/ note tutorial based around wxpython app wrote, concepts same.
Read more

c# - Access objects in UserControl from MainWindow in WPF -

-
i have simple xaml, how can change text property of textblock in usercontrol1 mainwindow ? <window x:class="refactorxaml.mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:refactorxaml="clr-namespace:refactorxaml" title="mainwindow" height="350" width="525"> <grid> <grid.rowdefinitions> <rowdefinition height="100"></rowdefinition> <rowdefinition height="100"></rowdefinition> </grid.rowdefinitions> <grid> <refactorxaml:usercontrol1></refactorxaml:usercontrol1> </grid> <grid grid.row="1"> <button>change text</button> </grid> </grid> </window> <usercon...
Read more

javascript - How to name a jQuery function to make a browser's back button work? -

-
i'm trying write function ajaxyfy web site, works perfect, except function button. that's have now: function loading() { if (typeof history.pushstate !== "undefined") { var historycount = 0; $('.menu-item, .logo').on('click','a',function(e){ e.preventdefault(); $(this).data('clicked', true); if ($(this).is('.logo a')) { var homepage = $(this).attr('href'); function1(homepage); history.pushstate(null, null, homepage); } else if ($(this).is('.projects a')) { var projects = $(this).attr('href'); function2(projects); history.pushstate(null, null, projects); } else { var pages = $(this).attr('href'); function3(pages); history.pushstate(null, null, pages); ...
Read more