The aim of the article is to prepare a model for making available metadata and digital objects of the new Globe Virtual Collection for the Map Collection of the Faculty of Science of Charles University. The globes are special cartographic documents; therefore, they are also described in a special way. The article deals with the digitization, visualization and accessibility of an old globe by Josef Jüttner from 1839, which comes from the depository of one of the most important central European collections. A simple model for a new virtual processing of the globe collection at Charles University is presented. SfM-MVS photogrammetry was chosen for digitization of the globe. The basic elements of the copperplate were set as basic parameters for image acquisition. Contrast, density, black line, line, dash and dot patterns and their complex use were observed for a good graphic design of the globe. Other parameters included a closer determination of the users for whom the resulting product is intended, as well as the profile of the users’ behavior on the site so far. New metadata were extracted from the bibliographic description. The virtual 3D globe was integrated into the database using the Cesium JavaScript library. Metadata and a 3D model of the globe were linked together and made available to the general public on the Globe page of the Map Collection of the Faculty of Science of Charles University. A comparison of web browsers was performed focusing on the loading time of the 3D model on the website. New graphic elements were identified with the new processing. It was possible to read the factual information written on the globe. Different possibilities and limitations of metadata description, photogrammetric methods and web presentation are described. This good practice can be applied by other virtual map collections.
Many people in Prague keep seeking a refuge in green areas within the city. Such a desire has inspired us to develop an app for cell phones that would be able to find natural areas in Prague. Users are navigated to the green spaces in real time and space. This article deals with the design and development of such app which has been aptly named DoPřírody! (To the Nature!). To create such an app requires a sound systemic design and also connection with a number of different components. Technically, it is a geoinformation community system composed of database, server, and mobile parts. First, it was necessary to define natural areas. Second, database of such areas containing exact position, description, type, photos, etc. was created. The server part includes application modules that secure users management, area search, routing, navigation, etc. The mobile part consists of user interface for cell phones. Special attention is given to the design and creation of algorithm that calculates the appropriate route within the road network which serves as a base for the navigation. DoPřírody! is also compared with competing projects like Googlemaps, Mapy.cz and OSM. Route length, time required, and computing time are the basic elements compared. DoPřírody! has all the features of a community system, i. e. logged-in users can contribute to further improvements. Anyone can update information on natural areas, upload more detailed descriptions, photographs, and comments. Thus, the whole system remains "live". At the present time there are some 80 users that have downloaded the free installation app on Google Play.
The article deals with cartographic assessment of two significant cartographic works from the beginning of the 17th century depicting the territory of Czech lands: map of Bohemia and map of Moravia by Petrus Kaerius (* 1571, † 1646). The map of Bohemia by Petrus Kaerius is based on Aretin’s map of Bohemia. The map of Moravia by Petrus Kaerius is a cartographic work derived from the map of Moravia created by Paulus Fabricius (*1519, †1588). To support these facts, cartometric analysis was carried out in both maps by Petrus Kaerius and their assumed originals. The methodology of map assessment is based on geometric analysis of sets of identical points in an old map and a reference map by means of multiquadratic interpolation. The geographic database DMU 25 was chosen as a suitable reference data set. Results of analyses comprising vectors of residuals on identical points, isolines of scale and rotation were visualized in the software package MapAnalyst.
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