Crop type maps are critical for tracking agricultural land use and estimating crop production. Remote sensing has proven an efficient and reliable tool for creating these maps in regions with abundant ground labels for model training, yet these labels remain difficult to obtain in many regions and years. NASA's Global Ecosystem Dynamics Investigation (GEDI) spaceborne lidar instrument, originally designed for forest monitoring, has shown promise for distinguishing tall and short crops. In the current study, we leverage GEDI to develop wall-to-wall maps of short vs tall crops on a global scale at 10 m resolution for 2019-2021. Specifically, we show that (1) GEDI returns can reliably be classified into tall and short crops after removing shots with extreme view angles or topographic slope, (2) the frequency of tall crops over time can be used to identify months when tall crops are at their peak height, and (3) GEDI shots in these months can then be used to train random forest models that use Sentinel-2 time series to accurately predict short vs. tall crops. Independent reference data from around the world are then used to evaluate these GEDI-S2 maps. We find that GEDI-S2 performed nearly as well as models trained on thousands of local reference training points, with accuracies of at least 87% and often above 90% throughout the Americas, Europe, and East Asia. Systematic underestimation of tall crop area was observed in regions where crops frequently exhibit low biomass, namely Africa and South Asia, and further work is needed in these systems. Although the GEDI-S2 approach only differentiates tall from short crops, in many landscapes this distinction goes a long way toward mapping the main individual crop types. The combination of GEDI and Sentinel-2 thus presents a very promising path towards global crop mapping with minimal reliance on ground data.

大型视力模型的无监督预训练方法已显示出可以提高下游监督任务的性能。为卫星图像开发类似的技术带来了重要的机会，因为未标记的数据很丰富，并且固有的时间和多光谱结构提供了途径，以进一步改善现有的训练策略。在本文中，我们提出了Satmae，这是基于蒙面自动编码器（MAE）的时间或多光谱卫星图像的预训练框架。为了利用时间信息，我们包括一个时间嵌入以及跨时间独立掩盖图像贴片。此外，我们证明将多光谱数据编码为具有不同光谱位置编码的频段组是有益的。我们的方法在基准数据集（最高$ \ uparrow $ 7 \％）上的监督学习绩效方面都对先前最先前的技术产生了强大的改进，以及在下游遥感任务（包括土地）上的转移学习绩效封面分类（最多$ \ uparrow $ 14 \％）和语义细分。

作物现场边界有助于映射作物类型，预测产量，并向农民提供现场级分析。近年来，已经看到深深学习的成功应用于划定工业农业系统中的现场边界，但由于（1）需要高分辨率卫星图像的小型字段来解除界限和（2）缺乏（2）缺乏用于模型培训和验证的地面标签。在这项工作中，我们结合了转移学习和弱监督来克服这些挑战，我们展示了在印度的成功方法，我们有效地产生了10,000个新的场地标签。我们最好的型号使用1.5亿分辨率的空中客车现货图像作为投入，预先列进法国界限的最先进的神经网络，以及印度标签上的微调，以实现0.86的联盟（iou）中位数交叉口在印度。如果使用4.8M分辨率的行星扫描图像，最好的模型可以实现0.72的中位数。实验还表明，法国的预训练减少了所需的印度现场标签的数量，以便在数据集较小时尽可能多地实现给定的性能水平。这些发现表明我们的方法是划定当前缺乏现场边界数据集的世界区域中的裁剪领域的可扩展方法。我们公开发布了10,000个标签和描绘模型，以方便社区创建现场边界地图和新方法。

对联合国可持续发展目标的进展（SDGS）因关键环境和社会经济指标缺乏数据而受到阻碍，其中历史上有稀疏时间和空间覆盖率的地面调查。机器学习的最新进展使得可以利用丰富，频繁更新和全球可用的数据，例如卫星或社交媒体，以向SDGS提供洞察力。尽管有希望的早期结果，但到目前为止使用此类SDG测量数据的方法在很大程度上在不同的数据集或使用不一致的评估指标上进行了评估，使得难以理解的性能是改善，并且额外研究将是最丰富的。此外，处理卫星和地面调查数据需要域知识，其中许多机器学习群落缺乏。在本文中，我们介绍了3个SDG的3个基准任务的集合，包括与经济发展，农业，健康，教育，水和卫生，气候行动和陆地生命相关的任务。 15个任务中的11个数据集首次公开发布。我们为Acceptandbench的目标是（1）降低机器学习界的进入的障碍，以促进衡量和实现SDGS; （2）提供标准基准，用于评估各种SDG的任务的机器学习模型; （3）鼓励开发新颖的机器学习方法，改进的模型性能促进了对SDG的进展。

高分辨率卫星图像已证明是可用于广泛的任务，包括衡量全球人口，当地经济生计和生物多样性，其中许多其他任务。不幸的是，高分辨率图像既不经常收集，购买昂贵，难以高效，有效地缩放这些下游任务在两次和空间。我们提出了一种新的条件像素综合模型，它使用丰富，低成本，低分辨率的图像，在位置和时间内产生准确的高分辨率图像。我们表明，我们的模型在钥匙下游任务 - 对象计数上达到了照片 - 现实的样本质量和竞争基线的竞争基线 - 特别是在地面上的条件正在快速变化的地理位置中。

We present a machine-learning framework to accurately characterize morphologies of Active Galactic Nucleus (AGN) host galaxies within $z<1$. We first use PSFGAN to decouple host galaxy light from the central point source, then we invoke the Galaxy Morphology Network (GaMorNet) to estimate whether the host galaxy is disk-dominated, bulge-dominated, or indeterminate. Using optical images from five bands of the HSC Wide Survey, we build models independently in three redshift bins: low $(0<z<0.25)$, medium $(0.25<z<0.5)$, and high $(0.5<z<1.0)$. By first training on a large number of simulated galaxies, then fine-tuning using far fewer classified real galaxies, our framework predicts the actual morphology for $\sim$ $60\%-70\%$ host galaxies from test sets, with a classification precision of $\sim$ $80\%-95\%$, depending on redshift bin. Specifically, our models achieve disk precision of $96\%/82\%/79\%$ and bulge precision of $90\%/90\%/80\%$ (for the 3 redshift bins), at thresholds corresponding to indeterminate fractions of $30\%/43\%/42\%$. The classification precision of our models has a noticeable dependency on host galaxy radius and magnitude. No strong dependency is observed on contrast ratio. Comparing classifications of real AGNs, our models agree well with traditional 2D fitting with GALFIT. The PSFGAN+GaMorNet framework does not depend on the choice of fitting functions or galaxy-related input parameters, runs orders of magnitude faster than GALFIT, and is easily generalizable via transfer learning, making it an ideal tool for studying AGN host galaxy morphology in forthcoming large imaging survey.

Wearable sensors for measuring head kinematics can be noisy due to imperfect interfaces with the body. Mouthguards are used to measure head kinematics during impacts in traumatic brain injury (TBI) studies, but deviations from reference kinematics can still occur due to potential looseness. In this study, deep learning is used to compensate for the imperfect interface and improve measurement accuracy. A set of one-dimensional convolutional neural network (1D-CNN) models was developed to denoise mouthguard kinematics measurements along three spatial axes of linear acceleration and angular velocity. The denoised kinematics had significantly reduced errors compared to reference kinematics, and reduced errors in brain injury criteria and tissue strain and strain rate calculated via finite element modeling. The 1D-CNN models were also tested on an on-field dataset of college football impacts and a post-mortem human subject dataset, with similar denoising effects observed. The models can be used to improve detection of head impacts and TBI risk evaluation, and potentially extended to other sensors measuring kinematics.

The number of international benchmarking competitions is steadily increasing in various fields of machine learning (ML) research and practice. So far, however, little is known about the common practice as well as bottlenecks faced by the community in tackling the research questions posed. To shed light on the status quo of algorithm development in the specific field of biomedical imaging analysis, we designed an international survey that was issued to all participants of challenges conducted in conjunction with the IEEE ISBI 2021 and MICCAI 2021 conferences (80 competitions in total). The survey covered participants' expertise and working environments, their chosen strategies, as well as algorithm characteristics. A median of 72% challenge participants took part in the survey. According to our results, knowledge exchange was the primary incentive (70%) for participation, while the reception of prize money played only a minor role (16%). While a median of 80 working hours was spent on method development, a large portion of participants stated that they did not have enough time for method development (32%). 25% perceived the infrastructure to be a bottleneck. Overall, 94% of all solutions were deep learning-based. Of these, 84% were based on standard architectures. 43% of the respondents reported that the data samples (e.g., images) were too large to be processed at once. This was most commonly addressed by patch-based training (69%), downsampling (37%), and solving 3D analysis tasks as a series of 2D tasks. K-fold cross-validation on the training set was performed by only 37% of the participants and only 50% of the participants performed ensembling based on multiple identical models (61%) or heterogeneous models (39%). 48% of the respondents applied postprocessing steps.

Camera pose estimation is a key step in standard 3D reconstruction pipelines that operate on a dense set of images of a single object or scene. However, methods for pose estimation often fail when only a few images are available because they rely on the ability to robustly identify and match visual features between image pairs. While these methods can work robustly with dense camera views, capturing a large set of images can be time-consuming or impractical. We propose SparsePose for recovering accurate camera poses given a sparse set of wide-baseline images (fewer than 10). The method learns to regress initial camera poses and then iteratively refine them after training on a large-scale dataset of objects (Co3D: Common Objects in 3D). SparsePose significantly outperforms conventional and learning-based baselines in recovering accurate camera rotations and translations. We also demonstrate our pipeline for high-fidelity 3D reconstruction using only 5-9 images of an object.

We present a retrospective on the state of Embodied AI research. Our analysis focuses on 13 challenges presented at the Embodied AI Workshop at CVPR. These challenges are grouped into three themes: (1) visual navigation, (2) rearrangement, and (3) embodied vision-and-language. We discuss the dominant datasets within each theme, evaluation metrics for the challenges, and the performance of state-of-the-art models. We highlight commonalities between top approaches to the challenges and identify potential future directions for Embodied AI research.