Geofoto is a Croatian company which offers photogrammetric, geoinformation, cartographic and cadastral services. The company began to operate in 1993 in Zagreb. The main products of Geofoto are aerial survey, digital photogrammetry, cadastral survey, production of topographic and cadastral databases, design and creation of geoinformation systems and solutions and digital cartography.
Geofoto's worldwide success is the result of many years of transparent relationship with the clients, a wide network of international partners, high technology and work of top experts. For the implemented quality control system Geofoto was awarded the certificate ISO 9001.
Aerial photogrammetric images are result of aerial photographing with cameras specially designed for that purpose. We are using two digital cameras (VEXCEL UltraCam X and VEXCEL UltraCam Xp) that collect images by directly recording them in the digital form. Cameras are fastened to special gyroscopically stabilized bases above the opening on the plane’s floor. Camera management is controlled by the GPS navigation and Inertial systems.
Data acquisition for developing of the Digital Terrain Model (DTM) is made by 3D photogrammetric data acquisition from aerial images (stereopairs) according to the principles of the CROTIS (Croatian Topographic Information System), or specifications from the State Geodetic Administration (SGA) developed within the CRONO-GIP project. Data acquisition for the production of the DTM can be performed by the customer's request.
Geoinformation system (GIS) is a computer-supported information system used for a digital visualisation and the analysis of geographic features and events happening on them.
Airborne laser scanning is a one of the most effective technologies for collecting large quantities of geospatial information.
LIDAR stands for Light Detecting And Ranging. In the domain of data collecting, this term is used for a system that collects positioning and altitude data that define surface of the terrain, but also above the ground facilities, by scanning profiles from the air. Mounted on a helicopter or aircraft, LIDAR system uses close range infrared part of electromagnetic spectrum (1064 nm) for active data collecting, in daylight or during the night, in a shadow, but also in circumstances of lower visibility (e.g., under the clouds). By using semiautomatic data filtering techniques, it is possible to create several useful products from the original data. Some of them are digital terrain model (DTM), vegetation model and digital surface model (DSM) that includes constructed objects.
In geoinformation systems, topographic data have replaced cartographic materials that had been used in classical, manual systems. Topographic data are saved in a databasis in vector and raster forms, according to the previously designed data model.
