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1.8. VIII. WMS-地图 Web 服务

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1.9. IX. WCS-栅格 Web 服务

1.9.1. 概述

WCS(OpenGIS® Web Coverage Service)当前版本是 1.1.2。WCS 标

准定义了一些操作,这些操作允许用户访问“Coverage”数据,如卫星影像、数字高程数据等,也就是栅格数据。

1.9.2. WCS 的操作

WCS 包括以下 3 个操作:

1.GetCapabilities(获取服务的元信息)

2.DescribeCoverage(获取 Coverage 的描述信息)

3.GetCoverage(获取Coverage)关于服务涉及的基本元素,可以参考前面的章节:《服务涉及的基本元素》。

1.9.3. GetCapabilities 操作

1.9.3.1. 1. KVP 格式请求

GetCapabilities 操作需要以下的参数:

参数

是否必须

默认值

SERVICE

WCS

REQUEST=GetCapabilities

ACCEPTVERSIONS

SECTIONS

UPDATESEQUENCE

ACCEPTFORMATS

以下是一个WCS使用KVP格式的GetCapabilities操作示例:

http://hostname:port/path?

service=WCS&

request=GetCapabilities

1.9.3.2. 2.XML格式请求

以下是一个WCS使用XML格式的GetCapabilities操作示例:

xml version="1.0" encoding="UTF-8"?>


<
GetCapabilities
 xmlns
="http://www.opengis.net/wcs/1.1.1"


xmlns
:xsi
="http://www.w3.org/2001/XMLSchema-instance"


xsi
:schemaLocation
="http://www.opengis.net/wcs/1.1.1 ../wcsGetCapabilities.xsd"


service
="WCS"
 />

1.9.3.3. 3.响应示例

以下是一个WCS的GetCapabilities操作的响应示例:

xml version="1.0" encoding="UTF-8"?>


<
wcs
:Capabilities
 xmlns
="http://www.opengis.net/wcs/1.1"


xmlns
:ows
="http://www.opengis.net/ows/1.1"
 xmlns
:xsi
="http://www.w3.org/2001/XMLSchema-instance"


xsi
:schemaLocation
="http://www.opengis.net/wcs/1.1 ../wcsDescribeCoverage.xsd http://www.opengis.net/ows/1.1 ../../../ows/1.1.0/owsAll.xsd"
>


<
ows
:ServiceIdentification
>


<
ows
:Title
>
Web Coverage Serviceows
:Title
>


<
ows
:Abstract
>
WCSows
:Abstract
>


<
ows
:ServiceType
>
WCSows
:ServiceType
>


<
ows
:AccessConstraints
>
NONEows
:AccessConstraints
>


ows
:ServiceIdentification
>


<
ows
:OperationsMetadata
>


<
ows
:Operation
 name
="GetCapabilities"
>



...

ows
:Operation
>


<
ows
:Operation
 name
="DescribeCoverage"
>



...

ows
:Operation
>


<
ows
:Operation
 name
="GetCoverage"
>



...

ows
:Operation
>


<
ows
:Constraint
 name
="PostEncoding"
>


<
ows
:AllowedValues
>


<
ows
:Value
>
XMLows
:Value
>


ows
:AllowedValues
>


ows
:Constraint
>


ows
:OperationsMetadata
>


<
wcs
:Contents
>



...

wcs
:Contents
>


wcs
:Capabilities
>

1.9.4. DescribeCoverage 操作

1.9.4.1. 1. KVP 格式请求

DescribeCoverage 操作需要以下的参数:

参数

是否必须

默认值

VERSION

1.1.2

SERVICE

WCS

REQUEST=DescribeCoverage

IDENTIFIERS

以下是一个WCS使用KVP格式的DescribeCoverage操作示例:

http://server_address/path/script?

service=WCS &

request=DescribeCoverage&

version=1.1.2 &

identifiers=Cov1,Cov2,Cov3

1.9.4.2. 2.XML格式请求

以下是一个WCS使用XML格式的DescribeCoverage操作示例:

xml version="1.0" encoding="UTF-8"?>


<
DescribeCoverage
 xmlns
="http://www.opengis.net/wcs/1.1"


xmlns
:xsi
="http://www.w3.org/2001/XMLSchema-instance"


xsi
:schemaLocation
="http://www.opengis.net/wcs/1.1 ../wcsDescribeCoverage.xsd"


service
="WCS"
 version
="1.1.2"
>


<
Identifier
>
Cov1Identifier
>


<
Identifier
>
Cov2Identifier
>


<
Identifier
>
Cov3Identifier
>


DescribeCoverage
>

1.9.4.3. 3.响应示例

以下是一个WCS的DescribeCoverage操作的响应示例:

xml version="1.0" encoding="UTF-8"?>


<
CoverageDescriptions
 xmlns
="http://www.opengis.net/wcs/1.1"


xmlns
:ows
="http://www.opengis.net/ows/1.1"
 xmlns
:xsi
="http://www.w3.org/2001/XMLSchema-instance"


xsi
:schemaLocation
="http://www.opengis.net/wcs/1.1 ../wcsDescribeCoverage.xsd http://www.opengis.net/ows/1.1 ../../../ows/1.1.0/owsAll.xsd"
>


<
CoverageDescription
>


<
ows
:Title
>
TBDows
:Title
>


<
ows
:Abstract
>
TBDows
:Abstract
>


<
Identifier
>
TBDIdentifier
>


<
Domain
>


<
SpatialDomain
>


<
ows
:BoundingBox
>


<
ows
:LowerCorner
>
-30.00 -30.00ows
:LowerCorner
>


<
ows
:UpperCorner
>
30.00 30.00ows
:UpperCorner
>


ows
:BoundingBox
>


SpatialDomain
>


Domain
>


<
Range
>


<
Field
>


<
ows
:Title
>
TBDows
:Title
>


<
ows
:Abstract
>
TBDows
:Abstract
>


<
Identifier
>
TBDIdentifier
>


<
Definition
>


<
ows
:AnyValue
 />


Definition
>


<
InterpolationMethods
>


<
InterpolationMethod
>
linearInterpolationMethod
>


<
Default
>
cubicDefault
>


InterpolationMethods
>


Field
>


Range
>


<
SupportedCRS
>
urn:ogc:def:crs:EPSG::XXXX

SupportedCRS
>


<
SupportedCRS
>
urn:ogc:def:crs:EPSG::YYYY

SupportedCRS
>


<
SupportedFormat
>
text/xmlSupportedFormat
>


CoverageDescription
>


CoverageDescriptions
>

1.9.5. GetCoverage 操作

1.9.5.1. 1. KVP 格式请求

GetCoverage 操作需要以下的参数:

参数

是否必须

默认值

VERSION

1.1.2

SERVICE

WCS

REQUEST=GetCoverage

IDENTIFIER

BOUNDINGBOX

FORMAT

TIMESEQUENCE

RANGESUBSET

STORE

GRIDBASECRS

GRIDTYPE

GRIDCS

GRIDORIGIN

GRIDOFFSETS

以下是一个WCS使用KVP格式的GetCoverage操作示例:

http://my.service.org/path/script?

service=WCS&

version=1.1.2&

request=GetCoverage&

identifier=Cov123&

BoundingBox=-71,47,-66,51,urn:ogc:def:crs:OGC:2:84&

format=image/netcdf

1.9.5.2. 2.XML格式请求

以下是一个WCS使用XML格式的GetCoverage操作示例:

xml version="1.0" encoding="UTF-8"?>

GetCoverage xmlns="http://www.opengis.net/wcs/1.1"

xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.opengis.net/wcs/1.1 ../wcsGetCoverage.xsd"

service="WCS" version="1.1.2">

ows:Identifier>Cov123ows:Identifier>

DomainSubset>

ows:BoundingBox crs="urn:ogc:def:crs:OGC:2:84">

ows:LowerCorner>-71 47ows:LowerCorner>

ows:UpperCorner>-66 51ows:UpperCorner>

ows:BoundingBox>

DomainSubset>

Output format="image/netcdf" />

GetCoverage>

1.9.5.3. 3.响应示例

以下是一个WCS的GetCoverage操作的响应示例:

xml version="1.0" encoding="UTF-8"?>

Coverages xmlns="http://www.opengis.net/wcs/1.1" xmlns:ows="http://www.opengis.net/ows"

xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:schemaLocation="http://www.opengis.net/wcs/1.1 ../owsCoverages.xsd http://www.opengis.net/ows/1.1 ../../../ows/1.1.0/owsAll.xsd">

Coverage>

ows:Title>TBDows:Title>

ows:Abstract>Coverage created from GetCoverage operation

request to a WCSows:Abstract>

Identifier>TBDIdentifier>

Reference xlink:href="http://my.server.com/coverage/image.tiff"

xlink:role="urn:ogc:def:role:WCS:1.1:coverage" />

Reference xlink:href="http://my.server.com/coverage/metadata.xml"

xlink:role="urn:ogc:def:role:WCS:1.1:metadata" />

Coverage>

Coverages>

1.9.6. ArcGIS Server 对 WCS 的支持

ArcGIS Server 10 中支持的 WCS 版本为1.0.0 19 。在 ArcGIS Server中,叧需简单地勾选的 Capabilities 选项卡中可以选择支持 WCS,如图 22。

19

并非最新版本,因此下面例子的参数和前面叙述的1.1.2 版本不同。

image0

图 22 ArcGIS Server 发布 WCS 服务

现在我们通过浏觅器直接发送请求获取栅格数据,返回格式选择 GeoTIFF:

http://localhost:8399/arcgis/services/basemap/World/MapServer/WCSServer?

version=1.0.0&request=GetCoverage&service=WCS&

crs=EPSG:4326&bbox=-180,-90,180,90&

width=720&height=360&

format=geotiff&

coverage=1

这个请求将会返回如下的结果:

image1