A Novel Invariant Based Commutative Encryption and Watermarking Algorithm for Vector Maps

Commutative encryption and watermarking (CEW) is an emerging method that combines encryption technology with digital watermarking technology. It has the dual capability of secure transmission and copyright protection. However, the existing CEW methods for vector maps have good robustness in resisting geometric attacks but poor resistance to vertex attacks (e.g., addition, deletion, etc.). To solve this problem, here we propose a novel invariant-based CEW algorithm for vector maps, which consists of permutation-based encryption scheme and coordinates-based watermarking scheme. In the encryption scheme, the encryption key is generated via the Gaussian distribution method combined with the SHA-512 hash method; then, the double random position permutation strategy is applied to the vector map encryption. In watermarking embedding scheme, the original watermark image is scrambled via logistic chaotic encryption before embedding, and the coordinates of all the vertices are normalized. Then, the scrambled watermark image is embedded into the normalized coordinates. Results show that: proposed method is more robust to conventional attacks (e.g., vertex addition and deletion, reordering and data format conversion) and geometric attacks (e.g., scaling and translation). In addition, compared with the existing CEW methods for vector maps, the proposed method has higher security and stronger robustness against vertex attacks.

From felt tip to technology: the challenges of representing traditional knowledge in a GIS platform to create a knowledge surface

Traditional knowledge (TK) has been the keystone to survival in the Arctic for thousands of years. Caribou are integral to the society, health and culture of the Inuit, the Indigenous peoples of the Arctic. There is a lack of research regarding caribou on King William Island (KWI), Nunavut. Through a project in Gjoa Haven, located on KWI, Inuit Elders and hunters used maps to help represent their knowledge of caribou in the region. These 32 maps were processed in a GIS to explore the spatial dimensions of TK, and different forms of knowledge representation. Using vector data the features drawn were separated into lines and polygons to show hotspots of caribou knowledge. Using a fuzzy raster methodology, all caribou data was summed to create a collective knowledge surface of the caribou features. These maps refine the data from the vector maps and create a continuous surface that aims to better reflect the collective nature of TK. This research explores the challenges of representing TK using western technologies, and application of fuzzy methodologies for improving the representation.

From felt tip to technology: the challenges of representing traditional knowledge in a GIS platform to create a knowledge surface

Traditional knowledge (TK) has been the keystone to survival in the Arctic for thousands of years. Caribou are integral to the society, health and culture of the Inuit, the Indigenous peoples of the Arctic. There is a lack of research regarding caribou on King William Island (KWI), Nunavut. Through a project in Gjoa Haven, located on KWI, Inuit Elders and hunters used maps to help represent their knowledge of caribou in the region. These 32 maps were processed in a GIS to explore the spatial dimensions of TK, and different forms of knowledge representation. Using vector data the features drawn were separated into lines and polygons to show hotspots of caribou knowledge. Using a fuzzy raster methodology, all caribou data was summed to create a collective knowledge surface of the caribou features. These maps refine the data from the vector maps and create a continuous surface that aims to better reflect the collective nature of TK. This research explores the challenges of representing TK using western technologies, and application of fuzzy methodologies for improving the representation.

Die Verschriftungen in der Dialekterhebung Friedrich Maurers in Baden und im Elsass als Evidenz für die Verbreitung der Standardlautung

This paper examines the development of lay transcriptions of base dialects within a period of 50 years in the early 20th century in the Upper Rhine area in Alsace and Baden. I argue that the spread of spoken standard German can be documented by the development of these transcriptions. In alignment with Ganswindt (2017), it is assumed that the still not widespread standard competence at the beginning of this period is reflected in ‚misspellings‘ in the transcriptions of the dialect, since the Standard German grapheme was associated with the phonetics of the regional standard. The lay transcriptions of the Upper German delabialization by the participating teachers from Friedrich Maurer’s indirect dialect survey from 1941 and the survey of the so-called Wenkeratlas from 1887/88 serve as data. A place-by-place comparison via vector maps allows to localize variation patterns. It can be shown that the ‘misspellings’ – i. e. rounded variants in the area of delabialization – are scattered throughout the area and significantly decrease in time as the spoken German standard is spreading. This is especially the case in the area of Baden, where the amount of ‘misspellings’ diminishes from about 30–60 % to 5–30 %. In Alsace, on the other hand, the amount of ‘misspellings’ is generally much lower and consequently the decrease is as well. I argue that the reason for the difference between transcriptions from Baden and Alsace is to be found in the different repertoire structures with a diglossia with two written standard languages – French and German – in Alsace.