Polar Mapping Update and WMS Experience

Shinobu KawahitoRemote Sensing Technology Center of Japan (RESTEC)

in support of Japan Aerospace Exploration Agency (JAXA)

WGISS-27 Toulouse

Overview

Thanks to WGISS members, we got• Advices on how to use EPSG dataset tool. • Helps on checking registered CRS (Coordinate

Reference System) and their EPSG code for polar regions.

• Additional advices on manipulating commercial software in some projections (such as EASE-Grid).

Purpose

Technical experiment about Polar Mapping system.

Result from the WGISS-26

Recent Activity

• Check EPSG code for JAXA/AMSR-E product• Check mapping software support for target code

As a next step, polar mapping test system has made using JAXA sample polar data.

Check EPSG for polar mapping

Build Test System

• Make test system using basic Mapping Component,

and adopt AMSR-E sample data

JAXA AMSR-E Level 3 Product in Polar Stereographic Projection（ Northern Hemisphere ）

Different CRSs are adopted

TB （ Brightness Temperature ） , IC （ Sea Ice Concentration ）

SWE （ Snow Water Equivalent ）

EPSG Check of JAXA AMSR-E （ Northern Hemisphere ）

-> Some CRSs are missing in current EPSG dataset, from the perspective of JAXA.

CRS in various WMS System

Target CRS in the test system.

Capabilities Test for Polar Mapping using Basic Mapping Component

-> System properly works with each CRS.

Views in different CRS (near polar)

Polar Stereographic Lambert Azimuthal Equal Area

Views in different CRS (wide area)

Polar Stereographic Lambert Azimuthal Equal Area

Lessons Learned Polar Mapping- Polar Mapping System can be built using FOSS.

EPSG code- Some polar related CRSs are not registered in EPSG dataset.

Projection- Presumably there is no single common “polar projection”

across various agencies and software. - In order to merge images of different projections, a question

is, inter-convertiviblity between different projections, for instance, such as Stereographic into/from Equal Area.

Lessons Learned (cont’)

- OGC definition of BBOX (Boundary Box) and software definition of BBOX might differ.

- For instance, in the recent WMS v1.3.0, BBOX means the outside limits of the region, while MapServer Software adopts pixel center of corner pixels.

WMS spec v1.3.0 MapServer Software v5.2

(minX, minY)

(maxX, maxY)

(minX, minY)

(maxX, maxY)

BBOX

Towards Further Enhancement

NSIDC

ESA• ENVISAT ASAR mosaic near real-time

Monthly Average layers• Sea Ice Extent - Nimbus/SMMR, DMSP/SSMI• Sea Ice Concentration - Nimbus/SMMR, DMSP/SSMI• Snow Extent - AVHRR, GOES • Snow Depth - Nimbus/SMMR, DMSP/SSMI

Others

Make prototype that publish JAXA polar data

Merge layers with layers from other WMS servers ..

• IDN ? .. to be checked

e.g.)

Now Considering ways for further enhancement e.g.)

SecurityRegarding security aspect,

Polar Mapping Test System: - Prototype Server address is not publicly announced. - IP filter at Fire-Wall, and Basic Authentication at the Web

Server.

Other Mapping Service: - Application URL is publicly announced. - IP filter at Fire-Wall - IP filter, Digest Authentication, SSL/https, and SSL/Client

Side Authentication at the Web Server and Browser.