GetMap请求返回白色图像

Question

我在使用Mapserver尝试使用GetMap请求显示我的地图时遇到问题，但它返回一个白色图像。我做了搜索，但我没有找到答案： 我的地图文件：

MAP
  IMAGETYPE      PNG
  EXTENT        -21 20 1 36  
  SIZE           700 400
  IMAGECOLOR     255 255 255
      PROJECTION
        "init=epsg:4326"
    END
    OUTPUTFORMAT
    NAME png
    MIMETYPE image/png
    DRIVER GD/PNG
    EXTENSION png
    IMAGEMODE PC256
    TRANSPARENT FALSE
  END
  WEB
  METADATA
    "wms_title" "Dans Layers and Stuff"
    "wms_onlineresource" "http://localhost:81/cgi-bin/mapserv.exe?"
    "wms_enable_request" "*"
    "wms_srs" "EPSG:4326"
    "wms_feature_info_mime_type" "text/html"
    "wms_format" "image/png"
  END
END
LAYER

NAME map1
TYPE polygon
STATUS default
CONNECTIONTYPE postgis
CONNECTION "dbname=postgres host=localhost port=5432 user=postgres"
DATA "geom from comgeo"
    PROJECTION
        "init=epsg:4326"
    END
  METADATA
    "wms_title" "map1"
  END
PROCESSING "SCALE=AUTO"
CLASS
   STYLE
    COLOR 232 232 232
    OUTLINECOLOR 32 32 32
END
END
END
END

这就是我用于我的请求的链接：

http://localhost:81/cgi-bin/mapserv.exe?map=/wamp64/www/wordpress/map1.map&version=1.3.0&request=GetMap&CRS=EPSG:4326&bbox=-21,20,1,36&width=760&height=360&layers=map1&styles=&FORMAT=image/png&TRANSPARENT=TRUE

BBox值是正确的。谢谢

Answer 1

您的网址上似乎缺少SERVICE = WMS参数。

Answer 2

当我用CRS：84和URL替换epsg：4326时，我确实解决了问题：

http://localhost:81/cgi-bin/mapserv.exe?map=/wamp64/www/wordpress/map1.map&request=GetMap&SERVICE=WMS&version=1.3.0&CRS=CRS:84&bbox=-21,20,1,36&width=700&height=400&layers=map1&styles=&FORMAT=image/png&TRANSPARENT=TRUE

Answer 3

WMS 1.1.1和WMS 1.3.0的版本对坐标系有不同的请求参数：SRS = EPSG：对于1.1.1为4326，对于1.3.0为CRS = CRS：84

请参阅mapserver wms