A hot spot refers to numerous crime incidents clustered in a limited space-time range. The near-repeat phenomenon suggests that every victimization might form a contagion-like pattern nearby in terms of both space and time. In this article, the near-repeat phenomenon is used to analyze the risk levels around hot spots. Utilizing a recent burglary dataset in N (a large city located in southeaste...

We present a new mean dynamic ocean topography product based on the improved geoid model, derived in Optimal Geoid for Modelling Ocean Circulation (OGMOC) project supported by European Space Agency. This model is Gravity Recovery and Climate Experiment (GRACE) Field Steady-State Explorer (GOCE) satellite missions combined with newer DTU15GRA altimetric surface gravity it was optimized to elimin...

Abstract A significant improvement in the accuracy and homogeneity has been achieved with new gravimetric geoid model for Kingdom of Saudi Arabia (KSA-Geoid21GRAV) w.r.t previous Geoid models KSA2009, KSA2015 KSA-Geoid17. The prediction was carried remove-compute-restore technique resulting external absolute accuracies at 10–11 cm level relative 1–5 ppm. In this work, estimation hybrid KSA-Geoi...

The swimming backward for biomimetic carangiform robot fish is analyzed and implemented in this paper. The swimming law of the carangiform robot fish is modified according to the European Eel swimming mode based on the multiple-link structure to implement the backward motion. The motion mode difference between the eel and carangiform fish is discussed, and a qualitative kinematic analysis of th...

Today the geoid can be conveniently determined by a set of high-degree spherical harmonics, such as EGM08 with a resolution of about 5'. However, such a series will be biased when applied to the continental geoid inside the topographic masses. This error we call the analytical downward continuation (DWC) error, which is closely related with the so-called topographic potential bias. However, whi...

To select the best geo-potential model for the determination of Hong Kong and Shenzhen local geoids, three models EGM96, WDM94 and GPM98CR were tested in the region using GPS/leveling data and gravity measurements. The data include GPS/leveling observations at 43 stations, 640 gravity measurements covering the whole territory of Hong Kong, and 62 high precision GPS/leveling observations and 487...