[Introduction] | [Using the TEC Graphic Service] | [Functions] | [Output] | [References] | [Authors]

 

1. Introduction:

This service is provided for generating high resolution maps with user's input information. Only Mercator (regional) and Hammer (global) projections are adopted in this version (Jan. 2008). The core graphic package included in this interface is the well-known Generic Mapping Tool (GMT), which is mainly developed and maintained by Paul Wessel and Walter H. F. Smith. It is released under the GNU General Public License. All the coordinates are taken in the WGS84 reference frame. This web graphic service is supported by grant (NSC 96-2745-M-001-003) from the National Science Council under Taiwan Earthquake Research Center (TEC) program.

 

2. Using the TEC Graphic Service:

Since this graphic service is a system demanding interface, we open this web service to only TEC members at the moment. To apply an authority to use this service, users (TEC members) have to register and activate their accounts. The procedure is listed bellow:

(1) Go to the TEC Graphic Service website at http://tecdc.earth.sinica.edu.tw/service/graphic/. (Figure 1)
(2) For a new user, please click on the "Registration" option.
(3) After filling the registration form and pressing the ¡§submit¡¨ button, the system will send a confirmation letter to your input e-mail address automatically.
(4) Click on the link that listed in the confirmation letter to activate your account.
(5) When your account has been activated, you can login this system to start using the TEC Graphic Service.
(6) A validation code with 4 alphanumeric characters is given in an image next to the empty field. Please enter it in the empty field.
(7) Remember to logout this service after finish mapping

TEC Graphic Service - Fig. 1
Figure 1. The main page of the TEC Graphic Service at http://tecdc.earth.sinica.edu.tw/service/graphic/

 

3. Functions:

It is easy to use this facility. The GUI design (Figure 2) of the TEC Graphic Service is composed of 4 frames: (1) Region selection, (2) Geographic Projection, (3) Background Topography/ Plate Boundaries, and (4) User input information.

TEC Graphic Service - Fig. 2
Figure 2. The Graphic User Interface (GUI ) design of the TEC Graphic Service

Firstly, you have to select a region to plot your map. To do this, please enter the border coordinates in the upper-left frame. Click on the Google Map or GMT "reference map" option, you can have a quick look to confirm if it is a desired region. Default projection is the Mercator projection. If you choose Hammer projection, you will have to input your desired central meridian. The border coordinates will be set to cover the whole world automatically. Secondly, you are able to decide whether you need a background topography, coast line, or nation borders in the map. Various color scales for topography are provided (See example). In addition, if you would like to see plate boundaries on the map, you may check the button of Plate Boundaries. Here we use the digital model of PB2002. Finally, you can put your own dataset onto this background map, including lines, points, focal mechanisms, and GPS velocity vectors.

If you intend to plot your own datasets, you should follow the format explained in the yellow "?" marks and create files on your computer. Check those items and click on the "Browse" button to indicate the files you are going to upload. Finally, press the "Submit" to send your request. To save working time, we suggest not selecting topography but only coast line before user input datasets are confirmed.

 

4. Output:

The final output (Figure 3) displays an image in portable Network Graphics (PNG) file format in the left panel, and a mapping information summary in the right panel. A high resolution map in postscript (PS) file format is provided for download. Topography credit is also shown for proper citation.


Figure 3. The layout of the final output of the Graphic Service.

 

5. Project:

After you send your request, you can decide if you want to save this request as a project or not. If you decide to save the project, all of the parameter, include the dataset you upload and the final output map, will be reserved.

You can click the button "Project Management" form GUI page of the TEC Graphic Service as shown in Figure 2 or from output page as shown in Figure 3. If you have ever saved any project before, there would be a page (Figure 4) that shows all the projects you have saved. You can select one of the project, then click the "Submit " button, it will go to the request home page with all the parameters you have saved before. If you want to delete one of the project, you have only to click the "Delete" link of the chosen project.


Figure 4. The Project Management Page

 

6.References:

Bird, P. (2003) An updated digital model of plate boundaries, Geochemistry Geophysics Geosystems, 4(3), 1027, doi:10.1029/2001GC000252.[Link]

ETOPO5 (1988), Data Announcement 88-MGG-02, Digital relief of the Surface of the Earth. NOAA, National Geophysical Data Center, Boulder, Colorado. [Link]

Liu, C. S., S. Y. Liu, S. E. Lallemand, N. Lundberg, D. Reed (1998), Digital Elevation Model Offshore Taiwan and Its Tectonic Implications., Terrestrial, Atmospheric and Oceanic Sciences, TAO, vol. 9, No.4, 705-738. [Link]

Smith, W. H. F., and D. T. Sandwell (1997), Global seafloor topography from satellite altimetry and ship depth soundings, Science, v. 277, p. 1957-1962, 26 Sept.. [Link]

Wessel, P. and W. H. F. Smith (1995), New Version of the Generic Mapping Tools Released, EOS Trans. AGU, 76, p329.

 

7. Authors:

This web service is designed by Wen-Tzong Liang and programmed by both Shin-Wei Hsiao and Wen-Tzong Liang. If you publish any results by taking advantage of this graphic service, please provide proper acknowledgement to TEC Data Center, Taiwan. If you have any questions or comments, please send mail to tecdc@earth.sinica.edu.tw Thank you.

 

January 9, 2008