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Current Projects

1. Autonomous Searching and Tracking of Shoreline Using UAS

Background: Despite rapid technological development of UAS technology, a completely autonomous unmanned aerial system is not a reality yet, particularly for civilian or commercial uses. There are many technological hurdles to overcome before autonomous unmanned aerial systems become widespread.  Even though some low-level of autonomy has been achieved for UAS, it still requires a human operator to control the flight of an UAS. There are many applications that can benefit from autonomous UAS technology. For example, running surveillance UAS flights around the clock can be too expensive due to the need for human operators. Similarly, flying an UAS in some inaccessible or hostile location can be too inconvenient or dangerous for a human operator. It is possible though to develop in some cases an application-specific, cost-effective solution for autonomous UAS by utilizing existing results already published in literature. Accordingly, in this project, we plan to develop an autonomous UAS to search and track a shoreline. This research will achieve a technological advancement that can help researchers in many fields who collect data from such environment for their study. The system can also be used for autonomous video surveillance.  

Problem Description: A shoreline lies along the edge of an ocean that separates land from water. The separation of land from water can be detected from aerial imagery as evident from some existing works that deal with similar situations. However, there exist some additional challenges that need to be addressed in this problem due to the fact that a shoreline is very dynamic, always changing due to waves, currents, winds, and tides. We plan to investigate how to detect a shoreline using a UAS in real time so that the UAS can follow the detected shoreline as a guide to fly itself over the coastline. The research to develop autonomous unmanned aerial systems for shoreline tracking can benefit other fields of research such as environmental science and ecology. In addition, it has many other civilian, governmental, and commercial applications.

Student Research Activities:

  • Fly UAS to collect aerial imagery of the shoreline along the Gulf Coast nearby campus.
  • Implement shoreline detection algorithms and test them for effectiveness and accuracy using aerial imagery data.
  • Simulate the flight path of an UAS using results obtained from the shoreline detection algorithms to determine its feasibility for real-time applications.

Subsequently, the REU participants will develop and integrate the shoreline detection system with the navigation system and test its effectiveness in real-time environments.

Student Background:  Basic computing knowledge and introductory programming skills such Java or C++ is recommended.

2. UAS Digital Mapping for Coastal Geoinformatics

Background: Coastal management requires accurate and timely information about the state of coastal landforms (e.g., beaches) and how they are evolving. Small-unmanned aircraft systems (UAS) equipped with digital cameras provide a new paradigm for surveying of coastal environments.  Compared to traditional field surveying methods or manned aircraft surveys, UAS provides certain advantages: rapid deploy capabilities, temporal flexibility, and hyperspatial image acquisition. When coupled with repeat observations, these data can be used to derive high definition 3D digital terrain models and to characterize spatial-temporal changes of built and natural terrain in coastal zones. This newly captured information can be used to improve management practices, engineering design, and scientific decision making as it relates to coastal resiliency. For example, UAS topography data can be used to improve model calibration and forecasting of coastal hazards such as hurricane impacts or oil spill distribution.

Problem Description: We plan to utilize UAS equipped with multispectral sensors for imaging of coastal landforms within the region: beaches, dunes, wetlands. The acquired image sequences will be processed using structure-from-motion (SfM) photogrammetry to derive 3D measurements (x, y, z point cloud data) for digital modeling of coastal terrain. Accordingly, 3D data processing and spatial analysis will be implemented using geospatial computing techniques and software to characterize coastal landforms and processes captured in the repeat UAS observations. For analyzing patterns in coastal landform evolution, open-source GIS software and spatial modeling approaches, such as space-time cube (STC) representation, will be applied to the time series of hyperspatial UAS point cloud and raster products. Image classification methods using the UAS multispectral imagery will be explored to develop automated approaches for landcover mapping. Finally, through these UAS-based analyses, students will explore coastal problems of immediate relevance and importance to the region, which is an area prone to erosion and coastal hazards.

Student Research Activities:

  • Design and conduct small UAS optical imaging surveys of coastal landforms adhering to resolution and accuracy specifications as well as current regulations.
  • Process collected imagery using SfM photogrammetry workflows to derive high fidelity 3D point cloud data and orthomosaic reflectance products.
  • Assess and improve UAS-SfM data accuracy using real-time-kinematic GPS surveying methods.
  • Perform 3D point cloud data processing to generate digital elevation models (DEMs) of terrain.
  • Develop image processing and classification algorithms using UAS-acquired multispectral imagery for landcover mapping.
  • Perform GIS-based spatial analysis with the UAS data products including: extracting morphology metrics, characterizing spatial-temporal trends in terrain evolution, assessing landcover change, and deriving geovisualization products in support of coastal decision making.

Student Background: Basic computing knowledge and introductory programming skills such in C++ or Python or MATLAB is recommended.

3. Automatic Crop and Vegetable Yield Prediction on UAS Images Based on Deep Convolutional Neural Network

Background: Crop yield estimation is an important task in product management and marketing. Accurate yield prediction helps farmers to make better decision on cultivation practices, plant disease prevention, and the size of harvest labor force. The current practice of yield estimation based on the manual counting of fruits or flowers by workers is very time consuming and expensive process and it is not practical for big fields. Unmanned aerial systems provide an efficient, cost-effective, flexible, and scalable solution for product management and yield prediction. Recently huge data has been gathered from agricultural fields. However, efficient analysis of those data is still a challenging task. In this project, a deep convolutional network will be developed to facilitate the accurate yield prediction and automatic counting of fruits and vegetables on the images acquired by UAS. 

Problem description: A widely adopted solution for automatic yield estimation is to count fruits or calculate the density of flowers on images using computer vision algorithms. Computer vision approaches currently face many difficult challenges in automatic counting of fruits or flowers. In this project, we will focus on data driven object detection algorithm based on deep convolutional neural network architecture. The aim of the proposed technique is to calculate the number of ripe and unripe fruits such as tomato, apple, and orange. This research will be built upon our current research in DeepCount. The students will also work on the plant disease classification based on deep convolutional neural network which will be built on our current research on UAV image classification.

Student Research Activities:
  • Study the fundamental of machine learning and convolution neural nets.
  • Create synthetic annotated data for object counting.
  • Process the UAS data collected over AgriLife research extension in Corpus Christi.
  • Improve our deep architecture to able to count variety of unripe and ripe fruits.
  • Improve our deep classification algorithm for plant disease detection on open access data.
  • Analyze the results on both training and testing dataset and compare the results with actual ground-truth

Student Background: Basic computing knowledge and introductory programming skills in C++ or Python is recommended.

4. Multi-Objective UAV Mission Planning Using Nature-inspired Metaheuristic Search Algorithms

Background: Metaheuristic search algorithms have been successfully used to solve a variety of optimization problem with huge search space. These search algorithms have a high capability to find, produce, or choose a heuristic solution for a diversity of single and multi-function optimization problems.  Providing a solution is quite challenge when their exits multiple objectives to achieve. UAV Mission Planning (MP) problem is one of these critical applications. In various military applications, we may use UAV for complex and high-risk missions to avoid human risk and increase efficiency. UAVs need to be sufficiently smart to autonomously follow a safe path to a pre-defined target behind enemy lines, avoid obstacles such as other aircraft or enemy missiles. UAV need to optimize a number of conflicting goals such as minimizing the distance of a path and achieving a high level of safety. In this project, the goal is   to develop an optimal trajectory for a UAV mission. This optimal trajectory shall allow the UAV to navigate over bumpy terrain. Nature-inspired metaheuristic search algorithms have been used with high performance to tackle the above described missions.

Problem Description: The aim of this project is to allow students to get a hand experience on Unmanned Aerial Vehicle (UAV) routing and mission planning. To achieve this goal, 1) we plan to explore various metaheuristic search algorithms for function optimization; 2) learn how to program metaheuristic search algorithms using Matlab; 3) design a path planning evaluation function with set of constraints that include minimization of time to goal, total mission accomplishment time, and avoidance of enemy detection systems such as radar; 4) solve the problem of multi-objective optimization using metaheuristic search algorithms (i.e., Genetic Algorithms, Particle Swarm Optimization) to create an optimal mission path.  An ultimate goal of this research is to allow students to develop a new routing (i.e., path planning) software for the UAV to accomplish a pre-programmed mission. Students will learn how to develop a graphical user interface for a software system to better utilize the system for various users.

Student Research Activities: The undergraduate researchers will perform the following tasks:  
  • Study the fundamental metaheuristic search algorithms and programming software.
  • Solve function optimization problem with constraints and multi-objective goals.
  • Create a work environment for mission planning using Matlab.
  • Learn how to enhance the evaluation function for obstacles avoidance.
  • Develop multiple mission paths as a backup plan for the autonomous UAV system.
Student Background: Students need to have basic computing knowledge and introductory programming skills in Matlab.