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GIS/Geomatics
WALSH offers technical support for Geospatial Science activities. A detailed explanation of the services offered is included below.

Design and Implementation of Geodatabases

WALSH has created a methodology for the design and implementation of geodatabases using an interface through the program Map Object (geographical part) and linking it with any alphanumeric database software (Oracle, Access, etc.).

This interface meets all client requirements and has an important competitive advantage: it is an open program and its applications and uses can be continually updated, changed, expanded or concentrated according to the specific needs of the user. The methodology is also compatible with the global concept of the system, as the files used are in a universal format. As a result, both CAD files (.dxf, .dwg, .dgn) and more common Geographical Information Systems (GIS) file (.shp, .img) can be used, and the system can be linked to a myriad of alphanumeric databases.

WALSH also has the knowledge and software capabilities to create and administer common geodatabases, such as those generated by the program ArcGis.

Design and Implementation of GIS-Web Applications
Each day the internet becomes an increasingly more important communication tool and offers greater possibilities to transmit and receive all sorts of information. Geographical Information Systems (GIS) are being supplemented by this development and being replaced by interactive web-based communication capabilities.

In this context, WALSH has included the Internet Map Server (IMS) technology among its services. Through this technology, large companies like ESRI have developed various systems, such as: MapObjects IMS, ArcView IMS, ArcIMS and MapGuide, which allow GIS applications to be created on the Internet / Intranet to visualize, consult and analyze geographic information over the web.

WALSH has a qualified group of professionals experienced in the management and administration of these programs, and, therefore, has the capacity to efficiently and effectively provide any type of design or implementation of these GIS-Web applications using any software that is required.

Geoinformation Updates
WALSH has an extensive array of resources for geoinformation updates, having generated themed geoinformation (Vegetation, Soil, Geomorphological, etc. cover) of nearly the entire Ecuadorian Amazon during more than 10 years of operation. Cartographic information is available in digital form at a scale of 1: 50,000 for all the client’s areas of interest.

Processing of Satellite Images

Digital processing draws upon a group of tools for the optimization and analysis of satellite images. Routine applications used by WALSH in studies are: optimization (enhancement), classification (supervised and unsupervised) and georeferencing of images.

Techniques for image improvement allow original image data to be modified to facilitate visual interpretation. Different techniques for the interpretation of this data using a computer allow for the spectral classification of data obtained by remote sensors. Georeferencing of data obtained from remote sensing systems refers to the techniques used to correct the geometrical distortions of the image; the establishment of a relationship between the coordinates of the image (in terms of row and columns) and a system of geographic coordinates; transformation functions (from one coordenate system to another); and the techniques for “resampling” (re-orientation of the image).

WALSH uses high resolution images, such as images from IKONOS and Quick Bird satellites, which have a resolution of 1 meter and 60 centimeters, respectively.

WALSH often uses these images to generate a vegetation cover of project areas. Vegetation cover is classified based on the refracting value in the satellite image. Field sample points are used to verify the different types of vegetation.
 
   
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