plants on salinized land should be implemented for areas polluted by heavy metals, the land should be restored by regulating and controlling physiochemical properties, using microbial techniques and gene conversion techniques, and suitable ecological restoration schemes should be explored. For salinized areas, land improvement and restoration techniques should be used and. This paper analyzed land degeneration in Daqing from three aspects erosion of black land belt resources, land salinization, and economic factors, and expounded corresponding ecological recovery measures. Land degradation is one of the most important factors influencing agricultural and industrial development. It is felt, however, that k-d trees could be quite useful in many applications, and examples of potential uses are given The main focus of this paper is theoretical.

An algorithm is presented to handle any general intersection query. Search algorithms are given for partial match queries with t keys specified and for nearest neighbor queries These performances far surpass the best currently known algorithms for these tasks. Various utility algorithms are developed their proven average running times in an n record file are: insertion, O(log(n)) deletion of the root, O(n(k-1)/k) deletion of a random node, O(n) and optimization (guarantees logarithmic performance of searches), O(n(log(n))). A significant advantage of this structure is that a single data structure can handle many types of queries very efficiently. It is shown to be quite efficient in its storage requirements. The k-d tree is defined and examples are given. This paper develops the multidimensional binary search tree (or k-d tree, where k is the dimensionality of the search space) as a data structure for storage of information to be retrieved by associative searches. Copyright © 2015 SCITEPRESS - Science and Technology Publications All rights reserved. These point clouds, hence, have been processed to compute roto-translation movement, in order to monitor breakwater conditions and estimate its damage over time.

During tests, several 3D depth maps of the barrier have been taken with a RGB-D camera. The experiments consisted of the hitting of a scale model barrier by waves in a laboratory tank, aiming to asses the robustness of a particular configuration of the breakwater (that is, the arrangement of the Accropodes building the structure).

We tested the proposed monitoring method with several laboratory experiments. The proposed method is able to estimate roto-translation movements of the Accropodes, building the armour layer of a breakwater, both under and above still water level, without any need of human interaction. In this paper we present a novel breakwaters monitoring approach based on the analysis of 3D point clouds acquired with RGB-D cameras. Breakwater monitoring is then a critical part of coastal engineering research, since it is crucial to know the state of a breakwater at any time in order to evaluate its health in terms of stability and plan restoration works. Breakwaters are marine structures useful for the safe harbouring of ships and the protection of harbours from sedimentation and coasts from erosion.

Breakwaters walkthrough